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Quiz 4
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Q.1
An interconnected membranous network of the cell composed of vesicles, flattened sacs and tubules is ... ... [ KCET 2012 ]
0%
a) Mitochondria
0%
b) Endoplasmic reticulum
0%
c) Lysosomes
0%
d) Nucleus
Explanation
Endoplasmic reticulum is a network of membranous tubules within the cytoplasm of a eukaryotic cell, continuous with the nuclear membrane. It usually has ribosomes attached and is involved in protein and lipid synthesis. Answer : (b)
Q.2
Most of the water found in the young cell occurs in ... ... [ DPMT 2002 ]
0%
a) Cell wall
0%
b) Nucleus
0%
c) Cytoplasm
0%
d) Vacuoles
Explanation
Water is present both inside and outside cells. In the body of a mammal for example although it is about 70% water by weight, about 46% (approximately 2/3) is inside cells, and about 23% (approx. 1/3) is present outside cells in blood plasma and other body fluids. Answer : (c)
Q.3
Which of the following subunits of ribosomes is composed of 23S rRNA and a 5S rRNA plus thirty one different proteins? [ kerala 2006 ]
0%
a) 30 S
0%
b) 40 S
0%
c) 50 S
0%
d) 60 S
Explanation
In most bacteria, the most numerous intracellular structure is the ribosome which is the site of protein synthesis in all living organisms. All prokaryotes have 70S (where S=Svedberg units) ribosomes while eukaryotes contain larger 80S ribosomes in their cytosol. Bacteria have 70S ribosomes, each consisting of a small (30S) and a large (50S) subunit. E. coli, for example, has a 16S RNA subunit (consisting of 1540 nucleotides) that is bound to 21 proteins. The large subunit is composed of a 5S RNA subunit (120 nucleotides), a 23S RNA subunit (2900 nucleotides) and 31 proteins.[15] Eukaryotes have 80S ribosomes located in their cytosol, each consisting of a small (40S) and large (60S) subunit. Their 40S subunit has an 18S RNA (1900 nucleotides) and 33 proteins. The large subunit is composed of a 5S RNA (120 nucleotides), 28S RNA (4700 nucleotides), a 5.8S RNA (160 nucleotides) subunits and 46 proteins Answer : (c)
Q.4
Which one is correctly matched ... ... [ Manipal 2001 ]
0%
a) F1 particle → ribosome
0%
b) Lysosome → acrosome
0%
c) Ribosome → single membrane band
0%
d) Chlorophyll a and chlorophyll b → chloroplast
Explanation
The number of F1 particles present in each mitochondria ranges from 100 to 1000. an organelle in the cytoplasm of eukaryotic cells containing degradative enzymes enclosed in a membran The acrosome is an organelle that develops over the anterior half of the head in the spermatozoa (sperm cells) of many animals including humans. Ribosomes are different from other organelles because they have no membrane around them that separates them from other organelles Chlorophyll a and chlorophyll b are present in the thylakoid membranes inside the 'chloroplast', an organelle found inside the cells of green tissue Answer : (d)
Q.5
Cellular organelles involved in energy transformation are ... ... [ Odisha 2003 ]
0%
a) Mitochondria and chloroplasts
0%
b) Chromoplasts and leucoplasts
0%
c) Mitochondria and chromoplasts
0%
d) Chloroplasts and leucoplasts
Explanation
It is generally believed that the energy-converting organelles of eucaryotes evolved from procaryotes that were engulfed by primitive eucaryotic cells and developed a symbiotic relationship with them. This would explain why mitochondria and chloroplasts contain their own DNA, which codes for some of their proteins Answer : (a)
Q.6
Which one is nucleotide? ... ... [ AMU 1991 ]
0%
a) Uridylic acid
0%
b) Thymidine
0%
c) Cytosine
0%
d) Glutamic acid
Explanation
Names of Nucleotides. The five bases are adenine, guanine, cytosine, thymine, and uracil, which have the symbols A, G, C, T, and U, respectively. The bases combine with the sugar to make the nucleotides adenosine, guanosine, cytidine, thymidine, and uridine. Uridine monophosphate (UMP), also known as 5′-uridylic acid (conjugate base uridylate), is a nucleotide that is used as a monomer in RNA. Answer : (a)
Q.7
Active transport is characterised by ... ... [ AMU 2010 ]
0%
a) Requires special membrane proteins
0%
b) Highly selective
0%
c) Requires ATP energy
0%
d) All the above
Explanation
The movement of ions or molecules across a cell membrane into a region of higher concentration, assisted by enzymes and requiring energy. Answer : (d)
Q.8
Water soluble pigment present in cell vacuole is ... ... [ MPPMT 1997 ]
0%
a) Anthocyanin
0%
b) Carotene
0%
c) Xanthophyll
0%
d) Chlorophyll
Explanation
The most common water soluble vacuolar pigments are anthocyanins (red, blue, purple) and anthoxanthins (ivory to deep yellow). Carotene, Chlorophyll are fat soluble and are not found in vacuoles Xanthophyll is equally soluble in both water and organic solvent. Answer : (a)
Q.9
Which is present nearest to plasma membrane in plant cell ... ... [ AFMC 2002 ]
0%
a) Secondary wall
0%
b) Primary wall
0%
c) Middle lamella
0%
d) Tonoplast
Explanation
The secondary cell wall is a structure found in many plant cells, located between the primary cell wall and the plasma membrane. The cell starts producing the secondary cell wall after the primary cell wall is complete and the cell has stopped expanding Answer : (a)
Q.10
Conservation of green tomatoes into red form involves ... .. [ JIPMER 1990 ]
0%
a) Formation of chromoplasts from chloroplasts
0%
b) Destruction of chloroplasts and development of chromoplasts from leucoplasts
0%
c) Formation of chromoplasts from proplastids
0%
d) All of the above
Explanation
Chromoplasts are formed either from chloroplast or from leucoplast. For e.g. green tomatoes and chillies turn red on ripening due to the formation of the red pigment called lycopin replacing the cholorophyll. Yellow pigment carotene is developed in the carrot by replacing leucoplast. Answer : (a)
Q.11
Chromosomes consist of ... ... [ MPPMT 2011 ]
0%
a) DNA
0%
b) Protein
0%
c) RNA
0%
d) DNA, RNA and protein
Explanation
Chromosomes a threadlike structure of nucleic acids and protein found in the nucleus of most living cells, carrying genetic information in the form of genes. nucleic acids is a complex organic substance present in living cells, especially DNA or RNA, whose molecules consist of many nucleotides linked in a long chain. Answer : (d)
Q.12
factory for synthesis of sugar in autotrophic eukaryotes is ... ... [ AIIMS 1992 ]
0%
a) Chloroplast
0%
b) Mitochondrion
0%
c) Endoplasmic reticulum
0%
d) Ribosome
Explanation
The synthesis of sugar takes place during photosynthesis in chloroplast of autotrophic eukaryotes. Answer : (a)
Q.13
Enzymes connected with oxidative electron transport system are found in ... .. [ Kerala 2004 ]
0%
a) Plastids
0%
b) Mitochondria
0%
c) Golgi bodies
0%
d) Endoplasmic reticulum
Explanation
The electron transport chain in the mitochondrion is the site of oxidative phosphorylation in eukaryotes. The electron transport chain in the cell is the site of oxidative phosphorylation in prokaryotes. The NADH and succinate generated in the citric acid cycle are oxidized, releasing energy to power the ATP synthase. Many enzymes are found in mitochondrion such as NADH dehydrogenase, Pyruvate oxidase, Succinate dehydrogenase, Glucose dehydrogenase which are essential for electron transport system Answer : (b)
Q.14
Plasma membrane is made of ... ... [ BHU 1992 ]
0%
a) Proteins and carbohydrates
0%
b) proteins and lipids
0%
c) Proteins, lipids and carbohydrates
0%
d) Proteins, some nucleic acid and lipids
Explanation
membranes are composed primarily of phospholipids and proteins and are typically described as phospholipid bi-layers. The plasma membrane is composed of a phospholipid bilayer, which is two layers of phospholipids back-to-back. Phospholipids are lipids with a phosphate group attached to them. The phospholipids have one head and two tails. The head is polar and hydrophilic, or water-loving. According to fluid mosaic model, plasma membranes are quasifluidic structures with a viscous lipid bilayer made up of phospholipids having proteins at places distributed as mosaic both on the surface and inside. Singer and Nicolson have described cell membrane as protein icebergs floating in sea of lipids. External proteins are called extrinsic proteins or peripheral proteins while the internal proteins are named intrinsic or integral. Answer : (c)
Q.15
rRNA is synthesised in ... ... [ Odisha 2006 ]
0%
a) E.R.
0%
b) Nucleus
0%
c) Nucleolus
0%
d) Cytoplasm
Explanation
The nucleolus makes ribosomal subunits from proteins and ribosomal RNA, also known as rRNA. It then sends the subunits out to the rest of the cell where they combine into complete ribosomes. Ribosomes make proteins; therefore, the nucleolus plays a vital role in making proteins in the cell. Answer : (c)
Q.16
Shape of metacentric chromosome in anaphase is ... ... [ AIIMS 1999 ]
0%
a) L-shaped
0%
b) V-shaped
0%
c) J-shaped
0%
d) I-shaped
Explanation
The position of the centromere affects the shape of the daughter chromosomes during anaphase. Metacentric chromosomes produce V-shaped daughter chromosomes, submetacentric appear J-shaped and acrocentric form I-shapes Answer : (b)
Q.17
Movement of cytoplasm around a vacuole is ... ... [ JKCMEE 2007 ]
0%
a) Circulation
0%
b) Rotation
0%
c) Regulation
0%
d) Somersault
Explanation
Cyclosis: These are movements of cytoplasm within a cell (also called protoplasmic streaming). These are of two types : Rotation : When the protoplasm moves around a single central vacuoles in either clockwise or anticlockwise direction e.g., leaf cells of Hydrilla, Vallisneria. Circulation: When the movement of protoplasm occurs around different vacuoles in different directions within the cell e.g., staminal hair of Tradescantia, shoot hairs of gourds. Answer : (b)
Q.18
The cells discovered in thin section of cork by Robert Hook were actually ... ... [ DPMT 1990 ]
0%
a) Cell walls
0%
b) Cellulose
0%
c) Protoplasm
0%
d) Nuclei
Explanation
The cell was first discovered and named by Robert Hooke in 1665. He remarked that it looked strangely similar to cellula or small rooms which monks inhabited, thus deriving the name. However what Hooke actually saw was the dead cell walls of plant cells (cork) as it appeared under the microscope. Answer : (a)
Q.19
Phospholipid molecules of cell membrane possess ... ... [ JKCMEE 2003 ]
0%
a) One polar head and one polar tail
0%
b) One non-polar head and one non-polar tail
0%
c) One polar head and two nonpolar tails
0%
d) One nonpolar head and two polar tails
Explanation
A single phospholipid molecule has a phosphate group on one end, called the “head,” and two side-by-side chains of fatty acids that make up the lipid “tails. All of the lipid molecules in cell membranes are amphipathic (or amphiphilic)—that is, they have a hydrophilic (“water-loving”) or polar end and a hydrophobic (“water-fearing”) or nonpolar end. The most abundant membrane lipids are the phospholipids. These have a polar head group and two hydrophobic hydrocarbon tails. Answer : (c)
Q.20
Telomeres ... ... [ CBSE 2000 ]
0%
a) Initiate RNA synthesis
0%
b) Help chromatids to move towards poles
0%
c) Seal ends of chromosomes
0%
d) Identify correct members of homologous pairs of chromosomes
Explanation
Telomeres function to protect the ends of chromosomes from sticking to each other. They also protect genetic information during cell division because a short piece of each chromosome is lost every time DNA is replicated. Cells use a special enzyme called telomerase to keep dividing, which lengthens their telomeres Answer : (c)
Q.21
Which cellular part is correctly described ... .... [ CBSE 2012 ]
0%
a) Thylakoids - Flattened membranous sacs forming grana
0%
b) Centrioles - Sites for active RNA synthesis
0%
c) Ribosomes - those in chloroplasts are larger ( 80 S) while those in cytoplasm are smaller ( 70S)
0%
d) Lysosomes - Optimally active at 8.5 pH
Explanation
Thylakoids - Flattened membranous sacs forming grana Centrioles are a membranous hollow microcylinders occur in pair and play important role in cell division. Ribosomes in chloroplast are 70 s type while those of cytoplasm in eukaryotic cells are 80 S type. The enzymes of lysosome (called suicidal bag) function at acidic pH (i.e., 5). Answer : (a)
Q.22
Flagella occur in ... ... [ WB 2007 ]
0%
a) Eukaryotic cell
0%
b) Prokaryotic cell
0%
c) Viruses
0%
d) Both a and b
Explanation
A flagellum (plural: flagella) is a long, whip-like structure that helps some single celled organisms move. It is composed of microtubules. Flagella are organelles defined by function rather than structure. Flagella vary greatly. Both prokaryotic and eukaryotic flagella can be used for swimming but they differ greatly in protein composition, structure, and mechanism of propulsion. The word flagellum in Latin means whip. Answer : (d)
Q.23
In endocytosis the cell ... ... [ KCET 2009 ]
0%
a) Divides cytoplasm in mitosis
0%
b) Digest itself
0%
c) Engulfs and internalises materials with its membrane
0%
d) Enable extracellular digestion of larger molecules
Explanation
endocytosis is the taking in of matter by a living cell by invagination of its membrane to form a vacuole. internalises is another term for endocytosis Answer : (c)
Q.24
Smallest cell organelles are ... ... [ AFMC 2002 ]
0%
a) Lysosomes
0%
b) Sphaerosomes
0%
c) Peroxisomes
0%
d) Ribosomes
Explanation
If we consider the surface area as the criteria then the smallest cell organelle is ribosome and the largest cell organelle is nucleus in animal cell & vacuole in plant cell. Answer : (d)
Q.25
What is mitoplast .... ... [ WB 2010 ]
0%
a) Membrane less mitochondria
0%
b) Mitochondria without inner membrane
0%
c) Another name of mitochondria
0%
d) Mitochondria without outer membrane
Explanation
A mitoplast is a mitochondrion that has been stripped of its outer membrane leaving the inner membrane intact. Answer : (d)
Q.26
Main function of mitochondria in a cell is ... .. [ CPMT 2002 ]
0%
a) Secretion
0%
b) Excretion
0%
c) Osmoregulation
0%
d) Respiration
Explanation
The main job of mitochondria is to perform cellular respiration. This means it takes in nutrients from the cell, breaks it down, and turns it into energy. Answer : (d)
Q.27
Cells connected by plasmodesmata form a system ... .... [ Odisha 2006 ]
0%
a) Symplast
0%
b) Apoplast
0%
c) Cross-connection
0%
d) None of the above
Explanation
plasmodesmata is a narrow thread of cytoplasm that passes through the cell walls of adjacent plant cells and allows communication between them. Symplast is a continuous network of interconnected plant cell protoplasts. Answer : (a)
Q.28
Largest subunit of prokaryotic ribosomes is ... ... [ JKCMEE 2008 ]
0%
a) 30 S
0%
b) 40 S
0%
c) 50 S
0%
d) 60 S
Explanation
Bacteria (prokaryotic) have 70S ribosomes, each consisting of a small (30S) and a large (50S) subunit. Answer : (c)
Q.29
Oxysomes or F0 - F1 particles occur on . ..... [ CBSE 1992 ]
0%
a) Thylakoids
0%
b) Mitochondrial surface
0%
c) inner mitochondrial membrane
0%
d) Chloroplast surface
Explanation
F1 particle is a part of the F0-F1 complex. It is the 'Fraction 1' of ATP synthase. There are 2 particles of mitochondria which is Fo and F1. They are part of inner cristae membranes of the mitochondria.They are globular structures and also called as Racker particles. Answer : (c)
Q.30
Which one is not properly paired ... ... [ JKCMEE 2004 ]
0%
a) Golgi apparatus → Breaking of complex macromolecules
0%
b) Endoplasmic reticulum → Protein synthesis
0%
c) Mitochondria → Oxidative phosphorylation
0%
d) Chloroplasts → Photosynthesis
Explanation
Lysosomes break down macromolecules into their constituent parts, which are then recycled. not Golgi apparatus Answer : (a)
Q.31
A disaccharide that gives two molecules of glucose on hydrolysis is ... ... [ DPMT 2011 ]
0%
a) Sucrose
0%
b) Maltose
0%
c) Lactose
0%
d) Both B and C
Explanation
Like glucose, maltose is a reducing sugar, because the ring of one of the two glucose units can open to present a free aldehyde group; the other one cannot because of the nature of the glycosidic bond. Maltose can be broken down to glucose by the maltase enzyme, which catalyses the hydrolysis of the glycosidic bond, to produce two molecules of α-D-glucose Hydrolysis of sucrose yields glucose and fructose. Product of hydrolysis of lactose are glucose and galactose. Answer : (b)
Q.32
Apparato reticulo interno was discovered by Golgi in ... .... [ RPMT 2000 ]
0%
a) 1898
0%
b) 1900
0%
c) 1925
0%
d) 1928
Explanation
Apparato reticulo interno was discovered in 1898 by Italian physician Camillo Golgi during an investigation of the nervous system. Answer : (a)
Q.33
Which of the following is incorrect ... ... [ CET Chd. 2006 ]
0%
a) plasmalemma is the outer cell membrane
0%
b) membrane surrounding an organelle is called subcellular membrane
0%
c) membranes forming endoplasmic reticulum are biomembranes
0%
d) prokaryotic cells do not have subcellular membranes
Explanation
A biological membrane or biomembrane is an enclosing or separating membrane that acts as a selectively permeable barrier within living things The endoplasmic reticulum serves many general functions, including the folding of protein molecules in sacs called cisternae and the transport of synthesized proteins in vesicles to the Golgi apparatus. Answer : (c)
Q.34
Membrane most abundant in a cell is .. .... [ WB 2008]
0%
a) Nuclear membrane
0%
b) Golgi membrane
0%
c) Plasma membrane
0%
d) E.R. membrane
Explanation
The ER has a central role in lipid and protein biosynthesis. Its membrane is the site of production of all the transmembrane proteins and lipids for most of the cell's organelles, including the ER itself, the Golgi apparatus, lysosomes, endosomes, secretory vesicles, and the plasma membrane. The ER membrane makes a major contribution to mitochondrial and peroxisomal membranes by producing most of their lipids. In addition, almost all of the proteins that will be secreted to the cell exterior—plus those destined for the lumen of the ER, Golgi apparatus, or lysosomes—are initially delivered to the ER lumen. Answer : (d)
Q.35
Polyribosomes are aggregates of ... ... [ BHU 1998 ]
0%
a) Ribosomes and rRNA
0%
b) Only rRNA
0%
c) Peroxisomes
0%
d) Several ribosomes held together by string of mRNA
Explanation
Polyribosomes or ergasomes are formed by the combination of 6-8 ribosomes attached on a single-strand of mRNA. mRNA brings about polymerisation of a specific protein molecule, with the help of ribosomes, from amino acid molecules found in the cytosol. Answer : (d)
Q.36
Ribosome is mainly formed of ... ... [ DPMT 2002 ]
0%
a) Enzymes
0%
b) DNA
0%
c) RNA
0%
d) None of the above
Explanation
A ribosome is made from complexes of RNAs and proteins and is therefore a ribonucleoprotein. Answer : (c)
Q.37
Detailed structure of the membrane was studied after the advent of electron microscope is .... [ AMU 2012 ]
0%
a) 1930s
0%
b) 1950s
0%
c) 1970s
0%
d) 1990s
Explanation
In the late 1950’s, the use of electron microscopy helped to discover that the membrane was composed of proteins and lipids and has a bilayer structure. Answer : (b)
Q.38
Which one is apparato reticol are ... ... [ CBSE 1992 ]
0%
a) Golgi apparatus
0%
b) Endoplasmic reticulum
0%
c) Microfilaments
0%
d) Microtubules
Explanation
Golgi apparatus was discovered in 1898 by Italian physician Camillo Golgi during an investigation of the nervous system. After first observing it under his microscope, he termed the structure as apparato reticolare interno ("internal reticular apparatus"). Answer : (a)
Q.39
Nucleus was discovered by ... .. [ AFMC 2003 ]
0%
a) Robert Brown
0%
b) Leeuwenhoek
0%
c) Robert Hooke
0%
d) Schleiden
Explanation
The cell nucleus was discovered by Antonie van Leeuwenhoek in the 18th century. He first observed its structure in a sample of salmon blood. However, its intricate details were furnished by Robert Brown in the year 1831 Answer : (a)
Q.40
In multicellular organisms, 70S ribosomes occur inside ... ... [ JKCMEE 2007 ]
0%
a) Nucleus
0%
b) Mitochondria
0%
c) Lysosome
0%
d) E.R.
Explanation
Mitochondria and Chloroplasts both have 70s Ribosome, since they are evolved from prokaryotic bacteria and developed a symbiotic relationship with the cell. in animal cell all the organelles possess 80s ribosomes except mitochondria and chloroplast they have 70s ribosomal unit. Answer : (b)
Q.41
Nucleus is covered by ... ... [ MPPMT 1997]
0%
a) Porous double membrane
0%
b) Porous single membrane
0%
c) Non-porous single membrane
0%
d) Non-porous double membrane
Explanation
The nuclear membrane consists two concentric phospholipid membranes. Nuclei contains a region called the nucleolus, where ribosome assembly begins. Besides, the nuclear membrane contains nuclear pore complexes that allow for transport of material into and out of the nucleus. Answer : (a)
Q.42
In isolated DNA kept at 82 -90°C .... ... [ CPMT 1991 ]
0%
a) The two strands uncoil and separate
0%
b) Fragmentation occurs
0%
c) Thymine is replaced by uracil
0%
d) The structure is stabilised
Explanation
The helical structure of double-stranded DNA is destabilized by increasing temperature. Above a critical temperature (the melting temperature), the two strands in duplex DNA become fully separated. Answer : (a)
Q.43
Consider the following statements A) Plant cells have centrioles which are absent in almost all animal cells B) Ribosomes are the site of protein synthesis. C) The middle lamella is the layer mainly of calcium carbonate which holds the different neighboring cells together D) In animal cells steroidal hormones are synthesized by smooth endoplasmic reticulum. Of the above statements... .... [ kerala 2010 ]
0%
a) A and B only are correct
0%
b) C and D are only correct
0%
c) B and D only are correct
0%
d) A and D only are correct
Explanation
Centrioles occur as paired cylindrical organelles together with pericentriolar material (PCM) in the centrosome of an animal cell. Centrioles are found as single structures in cilia and flagella in animal cells and some lower plant cells. Statementr A iis false Ribosomes are a cell structure that makes protein. Statemnet B is correct The middle lamella is a pectin layer which cements the cell walls of two adjoining plant cells together. It is the first formed layer which is deposited at the time of cytokinesis. The cell plate that is formed during cell division itself develops into middle lamella or lamellum. Statement C is false Smooth E R (SER) is associated with the production and metabolism of fats and steroid hormones. Statement D is correct Answer : (c)
Q.44
Organelle rich in manganese is ... ... [ kerala 2000 ]
0%
a) Ribosome
0%
b) Mitochondria
0%
c) Chloroplast
0%
d) Lysosome
Explanation
Mitochondrial respiration generates a proton gradient and superoxide radicals, suggesting a possible link between oxidative stress, mitochondrial integrity, and alkaline-induced cell death. Manganese superoxide dismutase removes superoxide radicals in mitochondria, and thus protects mitochondria from oxidative injury Answer : (b)
Q.45
The simplest amino acid is ... ... [ CBSE 2005]
0%
a) Glycine
0%
b) Lysine
0%
c) Tyrosine
0%
d) Aspartic acid
Explanation
Glycine, the simplest amino acid, obtainable by hydrolysis of proteins. Sweet-tasting, it was among the earliest amino acids to be isolated from gelatin (1820). Especially rich sources include gelatin and silk fibroin. Glycine is one of several so-called nonessential amino acids for mammals; i.e., they can synthesize it from the amino acids serine and threonine and from other sources and do not require dietary sources. The chemical structure of glycine is Answer : (a)
Q.46
It is not characteristic of active transport ... ... [ AMU 2011 ]
0%
a) Highly selective
0%
b) Insensitive to inhibitors
0%
c) Uphill transport
0%
d) Transporter saturates
Explanation
Presence of enzyme inhibitors slows down the rate of active transport. Answer : (b)
Q.47
Mitochondria do not occur in ... ... [ AFMC 2009 ]
0%
a) Human liver cell
0%
b) Human nerve cell
0%
c) Human erythrocyte
0%
d) Frog liver cell
Explanation
Mammal red blood cells (erythrocytes) contain neither nucleus nor mitochondria. Answer : (c)
Q.48
A component of cytoskeleton is ... ... [ Odisha 2003 ]
0%
a) Microtubule
0%
b) Bone
0%
c) Chitin
0%
d) Cartilage
Explanation
There are three main components of the cytoskeleton: microtubules, intermediate filaments (IF) and microfilaments, along with many other proteins that support those components. Answer : (a)
Q.49
Which one occurs in both prokaryotic and plant cells
0%
a) Nucleus
0%
b) Chloroplast
0%
c) Cell wall
0%
d) Mitochondria
Explanation
Prokaryotic cells do not have a true nucleus that contains their genetic material as eukaryotic cells do. Instead, prokaryotic cells have a nucleoid region, which is an irregularly-shaped region that contains the cell’s DNA and is not surrounded by a nuclear envelope. prokaryotes have no mitochondria Some other parts of prokaryotic cells are similar to those in eukaryotic cells, such as a cell wall surrounding the cell (which is also found in plant cells, although it has a different composition). Answer : (c)
Q.50
Lysosomes contain ... ... [ CBSE 1996 ]
0%
a) Carbohydrates
0%
b) Hormones
0%
c) Nucleic acids
0%
d) Hydrolases
Explanation
Lysosomes contain a wide variety of hydrolytic enzymes (acid hydrolases) that break down macromolecules such as nucleic acids, proteins, and polysaccharides Answer : (d)
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