MCQGeeks
0 : 0 : 1
CBSE
JEE
NTSE
NEET
English
UK Quiz
Quiz
Driving Test
Practice
Games
NEET
NEET Biology MCQ
Neet Biology Biomolecules Mcq
Quiz 5
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
Q.1
Carbohydrate stored in animals/both liver and muscles is ... ... [ DPMT 2008]
0%
a) Glucose
0%
b) Sucrose
0%
c) Starch
0%
d) Glycogen
Explanation
Glucose is the main source of fuel for our cells. When the body doesn't need to use the glucose for energy, it stores it in the liver and muscles in the form of glycogen. Glycogen is made up of many connected glucose molecules Answer : (d)
Q.2
Which is not having high energy phosphate bond? ... .... [ CPMT 1990]
0%
a) Creating phosphate
0%
b) GTP
0%
c) ATP
0%
d) AMP
Explanation
High energy phosphate reactions Reaction ATP + H2O → ADP + Pi ADP + H2O → AMP + Pi ATP + H2O → AMP + PPi PPi + H2O → 2 Pi Here Pi is inorganic phosphate Answer : (d)
Q.3
Simple polyhydroxy ketone molecule containing 3-7 carbons is ... ... [ kerala 2006]
0%
a) Disaccharide
0%
b) Monosaccharide
0%
c) Polysaccharide
0%
d) Dipeptide
Explanation
Monosaccharides often called simple sugars and are made of 3-7 carbon atoms with a free aldehyde or ketonic group. Since they have two or more hydroxyl groups (polyhydroxy groups) they are also called as polyhydroxy aldehydes or polyhydroxy ketones depending on the functional group present. Monosaccharides are subdivided into trioses, tetroses, pentoses depending upon the number of carbon atoms they possess. Answer : (c)
Q.4
Adenine, pentose sugar and phosphate interactive to form .... .... [ RPMT 2002]
0%
a) Adenosine
0%
b) Adenylic acid
0%
c) Adenosine diphospahte
0%
d) Adenine triphosphate
Explanation
Adenylic acid is a nucleotide found in RNA. It is an ester of phosphoric acid with the nucleoside adenosine. It consists of a phosphate group, a pentose sugar ribose, and the nucleobase adenine. Answer : (b)
Q.5
Cellulose is ... ... [ MPPMT 2002]
0%
a) Monosaccharide
0%
b) Polysaccharide
0%
c) Lipid
0%
d) Disaccharide
Explanation
Cellulose is a linear polysaccharide polymer with many glucose monosaccharide units. Answer : (b)
Q.6
Essential amino acid is ... ...[ CBSE 2000 ]
0%
a) Serine
0%
b) Phenylalanine
0%
c) Aspartic acid
0%
d) Tyrosine
Explanation
Phenylalanine is an essential amino acid meaning that it cannot be made in the body and must be ingested in the diet. Serine is a nonessential amino acid derived from glycine. Answer : (b)
Q.7
Prosthetic group of a glycoprotein consists of ... ...
0%
a) Lipids
0%
b) Nucleic acid
0%
c) Metal ions
0%
d) Carbohydrate
Explanation
Glycoprotein are conjugated proteins in which the prosthetic groups are carbohydrates. A prosthetic group is the non-amino acid component that is part of the structure of the heteroproteins or conjugated proteins, being covalently linked to the apoprotein The prosthetic group may be organic such as a vitamin, sugar(carbohydrate), RNA, phosphate or lipid or inorganic such as a metal ion. Answer : (d)
Q.8
What is unique to DNA alone ... ... [ DPMT 1994]
0%
a) Denaturation and renaturation
0%
b) Polymer complex
0%
c) Replication
0%
d) Resistance to temperature changes
Explanation
DNA replication is the basis for biological inheritance. It is a fundamental process occurring in all living organisms to copy their DNA. This process is 'semiconservative' in that each strand of the original double-stranded DNA molecule serves as a template for the reproduction of the complementary strand. Synthesis of RNA is usually catalyzed by an enzyme—RNA polymerase—using DNA as a template, a process known as transcription. Answer:(c)
Q.9
Maximum number of nitrogen atom occur in ... ... [ BHU 2001]
0%
a) Guanine
0%
b) Uric acid
0%
c) Urea
0%
d) Ammonia
Explanation
Answer : (a)
Q.10
Source of turpentine oil is ... ...[ Odisha 2010]
0%
a) Bark of Cinchona
0%
b) Lichen
0%
c) Gymnospermous wood
0%
d) Algae
Explanation
Turpentine oil is derived from the oleoresin (balsam) collected from the harvested from living trees, mainly pines. Pine, fir, spruce, and cedar are all examples Gymnospermous wood Answer : (c)
Q.11
Content of unsaturated fatty acid linolenic acid is highest in ... .... [ BHU 2001]
0%
a) Sunflower oil
0%
b) Cotton seed oil
0%
c) Groundnut oil
0%
d) Coconut oil
Explanation
Sunflower oil is characterized by its high concentration of linoleic acid (60–70%) followed by oleic acid (15–35%). Answer : (a)
Q.12
Thymine is ... ... [ AMU 2003]
0%
a) Amino acid
0%
b) Purine
0%
c) pyrimidine
0%
d) None of the above
Explanation
In DNA, the purines adenine (A) and guanine (G) pair up with the pyrimidines thymine (T) and cytosine (C), respectively. Answer : (b)
Q.13
A source of maximum energy is ... ... [ CPMT 1996 ]
0%
a) Carbohydrate
0%
b) Fat
0%
c) Protein
0%
d) Vitamins
Explanation
Fat is the body's most concentrated source of energy, providing more than twice as much potential energy as carbohydrate or protein (9 calories per gram versus 4 calories each per gram) Answer : (b)
Q.14
Benedict reagent test is conducted to confirm presence of ... ... [ KCET 2008]
0%
a) Protein
0%
b) Lipid
0%
c) Starch
0%
d) Reducing sugar
Explanation
The Benedict's test identifies reducing sugars (monosaccharide's and some disaccharides), which have free ketone or aldehyde functional groups. Benedict's solution can be used to test for the presence of glucose in urine. Answer : (d)
Q.15
Fehling's test is not positive in case of ... ... [ AIIMS 2002]
0%
a) Lactose
0%
b) Sucrose
0%
c) Glucose
0%
d) Fructose
Explanation
sucrose is a complex disaccharide, it is not classified as either an aldose or a ketone. Instead, it is a compound that contains both. glucose is aldose sugar and fructose is a ketose sugar. It has no free aldehydes or keto group Answer : (c)
Q.16
Inulin occurs in the root of ... ... [ BHU 1999 ]
0%
a) Mango
0%
b) Dahlia
0%
c) Wheat
0%
d) Sugarcane
Explanation
Inulin, polysaccharide that is a commercial source of the sugar fructose. It occurs in many plants of the family Asteraceae (Compositae), particularly in such roots and tubers as the Dahlia and the Jerusalem artichoke. Inulin forms a white, crystalline powder that is as sweet as sucrose. Answer : (b)
Q.17
Nucleotide found free in the cells is ... ... [ AFMC 1991]
0%
a) cAMP
0%
b) AMP
0%
c) ADP
0%
d) ATP
Explanation
In a free nucleotide, there may be one, two, or three phosphate groups attached to the sugar, as a chain of phosphates attached to the 5 carbon. These are adenosine triphosphate (ATP), flavin adenine dinucleotide (FAD), and nicotinamide adenine dinucleotide (NAD + ). ATP is a nucleotide that consists of three main structures: the nitrogenous base, adenine; the sugar, ribose; and a chain of three phosphate groups bound to ribose. Answer : (d)
Q.18
Prostaglandins are ... ...
0%
a) Simple proteins
0%
b) Carbohydrates
0%
c) fatty acids
0%
d) lipid compounds
Explanation
Prostaglandins (PGs) are physiologically and pharmacologically active, lipid compounds resembling hormones Answer : (d)
Q.19
Glucose is .... ... [ RPMT 2005]
0%
a) Cane sugar
0%
b) Grape sugar
0%
c) Malt sugar
0%
d) Dextrose
Explanation
Dextrose is the name given to glucose produced from corn. Biochemically they are identical. Answer : (a)
Q.20
The most important element associated with protoplasm and proteinaceous materials of plants is .... .... [ MPPMT 2010]
0%
a) Nitrogen
0%
b) Oxygen
0%
c) Sulphur
0%
d) Potassium
Explanation
Nitrogen is the most essential mineral element. It forms an important component of the amino acid which combines to form protein. It is a non-metal element which is present in gaseous state. It forms an important component of some of the important protoplasmic proteins like phosphoprotein and lipoprotein which provides structural and functional integrity to the cell. Answer : (a)
Q.21
Which ones would be components of proteins? ... .. [ Wardha 2001]
0%
a) CHOP
0%
b) CHO
0%
c) CHON
0%
d) CONS
Explanation
Answer : (c)
Q.22
Enzyme connected with transfer of electrons are ... ... [ MPPMT 2002]
0%
a) Hydrolyses
0%
b) Hydrogenases
0%
c) Proteases
0%
d) Transaminases
Explanation
Transaminases are a group of enzymes that catalyze the interconversion of amino acids and oxoacids by transfer of amino groups. Hydrogenases catalyze the conversion of molecular hydrogen to protons and electrons by a heterolytic splitting mechanism. Proteases whose catalytic function is to hydrolyze peptide bonds of proteins. Answer : (b)
Q.23
Mineral associated with cytochrome is ... ..... [ CBSE 1991]
0%
a) Cu
0%
b) Mg
0%
c) Fe and Mg
0%
d) Fe and Cu
Explanation
Cytochrome are any of a number of compounds consisting of haem bonded to a protein. The basic functional unit of cytochrome oxidase contains four metals, two copper and two iron atoms, which are bound to the seven polypeptide chains Answer : (d)
Q.24
The bonds present between AMP + Pi and ADP+Pi are .... ...
0%
a) Phosphoester bonds
0%
b) Phosphoanhydride bonds
0%
c) Phosphodiester bonds
0%
d) Covalent bonds
Explanation
ATP is an unstable molecule which hydrolyzes to ADP and inorganic phosphate when it is in equilibrium with water. The high energy of this molecule comes from the two high-energy phosphate bonds. The bonds between phosphate molecules are called phosphoanhydride bonds. They are energy-rich and contain a ΔG of -30.5 kJ/mol. Answer : (b)
Q.25
Most abundant organic compound on earth is ... .... [ CBSE 2001]
0%
a) Cellulose
0%
b) Protein
0%
c) Lipids
0%
d) Steroids
Explanation
Cellulose is the most abundant organic compound on Earth. Answer : (a)
Q.26
Which is not true about inorganic catalyst and enzymes? ... ...[ RPMT 1996]
0%
a) They are specific
0%
b) Inorganic catalysts require specific factors not needed by enzymes
0%
c) They are sensitive to pH
0%
d) They speed up the rate of chemical reaction
Explanation
Enzymes
Inorganic Catalysts
They are globular proteins
They are mineral ions or small molecules
They can promote a specific reaction of a substrate.
They can promote diverse reaction.
They are regulated by specific molecules.
They are not regulated by any regulator molecules.
They are synthesized by ribosomes in the living cells
They are not synthesized in the living cells
They are more sensitive to temperature and pH
They are less sensitive to temperature and pH
Answer : (b)
Q.27
In competitive inhibition ... ... [ Manipal 2001]
0%
a) Inhibitor binds to active site
0%
b) Feed back operates
0%
c) Allosteric mechanism is involved
0%
d) All the above
Explanation
In competitive inhibition, an inhibitor that resembles the normal substrate binds to the enzyme, usually at the active site, and prevents the substrate from binding. At any given moment, the enzyme may be bound to the inhibitor, the substrate, or neither, but it cannot bind both at the same time. Answer : (a)
Q.28
Which is used for stating lipids .... .... [ Odisha 2012]
0%
a) Rhodamine
0%
b) Iodine
0%
c) Ethidium bromide
0%
d) Sudan Red
Explanation
Sudan III is used to identify the presence of lipids in liquids. It will stain fat cells red Answer : (d)
Q.29
Nucleic acids/nuclein were first discovered by ... ..... [ MPPMT 1991]
0%
a) Altmann
0%
b) Fleming
0%
c) Miescher
0%
d) Koch
Explanation
The Swiss scientist Friedrich Miescher discovered nucleic acids (DNA) in 1868. Answer : (c)
Q.30
Cerebroside is a .... .....
0%
a) Glycolipid
0%
b) Sterol
0%
c) Phospholipid
0%
d) Steroid
Explanation
Cerebroside is a any of a group of complex lipids present in the sheaths of nerve fibres Types of glycolipids Cerebrosides: a group glycosphingolipids involved in nerve cell membranes. Gangliosides: the most complex animal glycolipids. Globosides: glycosphingolipids with more than one sugar as part of the carbohydrate complex. Glycophosphosphingolipids: complex glycophospholipids from fungi, yeasts, and plants Glycophosphatidylinositols: a sub-group of glycolipids defined by a phosphatidylinositol lipid moiety bound to a carbohydrate complex Answer : (a)
Q.31
Which one is disaccharide? ... .... [ KCET 1999 ]
0%
a) Glucose
0%
b) Cellulose
0%
c) Maltose
0%
d) Ribose
Explanation
A disaccharide (also called a double sugar ) is the sugar formed when two monosaccharides (simple sugars) are joined by glycosidic linkage. Three common examples are sucrose, lactose, and maltose. Answer : (c)
Q.32
Scleroproteins are .... ..... [ kerala 2003] Explanation is provided, please click on
0%
a) Glycoproteins
0%
b) keratins
0%
c) Collagens
0%
d) Both b and c
Explanation
Scleroproteins are an insoluble structural protein such as keratin, collagen, or elastin. Answer : (d)
Q.33
In RNA, thymine is replaced by ... .. [ AIIMS 2001]
0%
a) Adenine
0%
b) Guanine
0%
c) Cytosine
0%
d) Uracil
Explanation
RNA have Uracil instead of Thyamine because RNA is evolutionary older than DNA and also because Thymine is methylated form of Uracil it gives a more stabilized structure to DNA Answer : (d)
Q.34
Ribosome .... .... [ Manipur 2005]
0%
a) Consists of one large and two small subunits
0%
b) Contains identical components in prokaryote and eukaryote
0%
c) Is the only site of RNA replication
0%
d) Has two or three major sites to which tRNA can be bound
Explanation
All prokaryotes have 70S (where S=Svedberg units) ribosomes. The 70S ribosome is made up of a 50S and 30S subunits. The 50S subunit contains the 23S and 5S rRNA while the 30S subunit contains the 16S rRNA. Eukaryotes contain larger 80S ribosomes in their cytosol. Answer : (b)
Q.35
Maximum iron occurs in ... ... [ RPMT 1995]
0%
a) RBC
0%
b) WBC
0%
c) Bone cells
0%
d) Protein
Explanation
Two thirds of body iron is present in circulating red blood cells as hemoglobin. Each gram of hemoglobin contains 3.47 mg of iron Answer : (a)
Q.36
An amino acid without asymmetrical carbon atom is ... .... [ AFMC 1997]
0%
a) Histidine
0%
b) threonine
0%
c) Phenylalanine
0%
d) Glycine
Explanation
Glycine is the only amino acid with no asymmetric (chiral) carbon because it has two hydrogens attached to alpha carbon. Answer : (d)
Q.37
Steroid is .... ..... [ DPMT 1999 [
0%
a) Cholesterol
0%
b) Thyroxine
0%
c) Vitamin A
0%
d) Fatty acid ester
Explanation
Cholesterol belongs to the steroid family of lipid (fat) compounds. Answer : (a)
Q.38
Mineral functioning as chemical messenger is .... ...
0%
a) Calcium
0%
b) Magnesium
0%
c) Manganese
0%
d) Molybdenum
Explanation
Calcium ions are one type of second messengers and are responsible for many important physiological functions including muscle contraction, fertilization, and neurotransmitter release. Answer : (a)
Q.39
Which of the following has coenzyme activity? .... ..... [ AMU 1992]
0%
a) Nicotinamide
0%
b) Purine
0%
c) Pyrimidine
0%
d) Both b and c
Explanation
Nicotinamide adenine dinucleotide is a coenzyme which is only loosely bound to the active site of the enzymes Answer : (a)
Q.40
Pentadiplandra brazzeana, the source of sweetest protein is found in ... .... [ MHT CET 2010]
0%
a) Sri Lanka
0%
b) Africa
0%
c) Arabia
0%
d) Australia
Explanation
Brazzein is the smallest sweet-tasting protein and was isolated from the wild African plant Pentadiplandra brazzeana Answer:(b)
Q.41
Number of essential amino acids in humans is ... ... [ BHU 1998]
0%
a) 14
0%
b) 10
0%
c) 9
0%
d) 6
Explanation
list of essential amino acids found in your body: Isoleucine Histidine Leucine Methionine Lysine Phenylalanine Tryptophan Threonine Valine Answer : (c)
Q.42
In ATP high energy bond occurs between .... .... [ KCET 2002]
0%
a) Phosphate and phosphate
0%
b) Ribose and phosphate
0%
c) Adenine and phosphate
0%
d) Adenine and ribose
Explanation
ATP (Adenosine Triphosphate) contains high energy bonds located between each phosphate group. These bonds are known as phosphoric anhydride bonds. Answer : (a)
Q.43
Which one is nucleotide? ... .. [ AMU 1991]
0%
a) Uridylic acid
0%
b) Thymidine
0%
c) Cytosine
0%
d) Glutamic acid
Explanation
uridylic acid (conjugate base uridylate), is a nucleotide that is used as a monomer in RNA Thymidine is a pyrimidine deoxynucleoside. Cytosine can be found as part of DNA, as part of RNA, or as a part of a nucleotide Glutamic acid is an α-amino acid Answer : (a)
Q.44
Which of the following properties of starch makes it useful as storage material? ... ... [ CBSE 2008] Easily translocated Chemically nonreactive Easily digested by animals Osmotically inactive Synthesised during photosynthesis
0%
a) 1, 3, 5
0%
b) 1 and 5
0%
c) 2 and 3
0%
d) 2 and 4
Explanation
Carbohydrates like glycogen and starch are relatively easy to store because of the following advantages. They are stored in bulk. They are chemically non-reactive. They are osmotically inactive. Answer : (d)
Q.45
Two fatty acid monomers are joined by ... .... [ CMC 2002]
0%
a) Hydrogen bond
0%
b) Peptide bond
0%
c) Phosphodiester bond
0%
d) Ester bond
Explanation
Lipids form an ester linkage between the carboxyl group of a fatty acid and the hydroxyl group of an alcohol monomer such as glycerol. Answer : (d)
Q.46
Bond present between two nucleotides of a polynucleotide is ... ... [ DPMT 1999 ]
0%
a) Covalent bond
0%
b) Hydrogen bond
0%
c) Phosphodiester bond
0%
d) High energy phosphate bond
Explanation
The sugars which are present in the nucleotide are ribose or deoxyribose. The nitrogenous bases are purines and pyrimidines. Polynucleotides are formed by covalent linkages between the phosphate of one nucleotide and the sugar of another, phosphodiester bond is the linkage between the 3' carbon atom of one sugar molecule and the 5' carbon atom of another, Answer : (c)
Q.47
Ester linkages occur in ... .... [ JIPMER 1997]
0%
a) Nucleic acids
0%
b) Lipids
0%
c) Carbohydrates
0%
d) Proteins
Explanation
The type of lipid found in fat cells for this purpose is a triglyceride, an ester created from glycerol and three fatty acids. Answer : (b)
Q.48
Ca2+ and Mg2+ .. ...
0%
a) Reduce excitability of nerves and muscles
0%
b) Increases excitability of nerves and muscles
0%
c) Conduct nerve impulses
0%
d) Both b and c
Explanation
A variety of ions, including potassium and divalent cations, have been shown to reduce intradental nerve excitability when applied in relatively high concentrations to dentine close to the pulp. Na+, K+, and Ca2+, Mg2+ each regulate the excitability of neurons. Answer : (a)
Q.49
A semi-indispensible amino acid for human consumption is ... ... [ AMU 1992]
0%
a) Arginine
0%
b) Valine
0%
c) Lysine
0%
d) Leucine
Explanation
Arginine and histidine form the group of so-called semi-essential amino acids. They have to be consumed in the diet under certain circumstances. Arginine is a complex amino acid, often found at active site in proteins and enzymes due to its amine-containing side chain Eight amino acids are essential for humans, as the body cannot produce them by themselves, and they have to be supplied externally. These are: isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan and valine. Answer : (a)
Q.50
Which is present in very little quantity in the body ... ... [ AIIMS 2011]
0%
a) K
0%
b) Mg
0%
c) Ca
0%
d) Cu
Explanation
Answer : (d)
0 h : 0 m : 1 s
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
Report Question
×
What's an issue?
Question is wrong
Answer is wrong
Other Reason
Want to elaborate a bit more? (optional)
Support mcqgeeks.com by disabling your adblocker.
×
Please disable the adBlock and continue.
Thank you.
Reload page