NEET Biology Biomolecules MCQs Set F

Question: Which one of the following bases is found only in RNA and not in DNA?

• a) Uracil
• b) Thymine
• c) Adenine
• d) Guanine

Answer: Uracil

Question: The scientists who discovered the structure of DNA molecule

• a) Waston and Crick
• b) Khorana and Nirenberg
• c) Miller and mandal
• d) Calvin and Wilkinson

Answer: Waston and Crick

Question:  Mention the example of dinuclotide in the given structure.

• a) RNA with UA
• b) RNA with CG
• c) DNA with TA
• d) DNA with CG

Answer: RNA with UA

Question: The structure of DNA like a spiral ladder because

• a) Two polynucleotide chains arranged parallel to each other and are spirally Twisted
• b) All nucleotides join through a phosphodiester bond
• c) Purine and Pyrimidine linked with hydrogen bond
• d) Purine and Pyrimidine are on the opposite side

Answer: Two polynucleotide chains arranged parallel to each other and are spirally Twisted

Question: The hydrogen bonds between adenine and guanine are

• a) 0
• b) 1
• c) 2
• d) 3

Answer: 0

Question: Which of the following is correct?

• a) A=T
• b) C=G
• c) G=A
• d) A=C

Answer: A=T

Question: Nitrogen bases do not contain

• a) Phosphorus
• b) Nitrogen
• c) Hydrogen
• d) Carbon

Answer: Phosphorus

Question: Which one is two ringed nitrogenous base?

• a) Adenine
• b) Thymine
• c) Cytosine
• d) Uracil

Answer: Adenine

Question: Which of the following ratio is constant in the DNA of all the species?

• a) A+T / C+G
• b) A+C / T+G
• c) A+G/ C+T
• d) A+U / T+C

Answer: A+T / C+G

Question: m-RNA is the polymer of

• a) Ribonucleotide
• b) Ribonucleoside
• c) Deoxyribonucleotide
• d) Ribosome

Answer: Ribonucleotide

Question: Which of the following is incorrect?

• a) t-RNA are synthesized by m-RNA
• b) m-RNA is degreased after its function is over
• c) r-RNA is localized in the ribosome
• d) m-RNA carries genetic code in to cytoplasm

Answer: t-RNA are synthesized by m-RNA

Question: Which is longest of all RNA?

• a) m-RNA
• b) t-RNA
• c) r-RNA
• d) None above

Answer: m-RNA

Question: Which one is known as adapter molecule?

• a) t-RNA
• b) r-RNA
• c) m-RNA
• d) DNA

Answer: t-RNA

Question: The common instant source of energy of cellular activities is

• a) ATP
• b) RNA
• c) DNA
• d) Mitochondria

Answer: ATP

Question: The RNA transporting amino acid to the protein synthesizing site known as

• a) t-RNA
• b) r-RNA
• c) m-RNA
• d) None of these

Answer: t-RNA

Question:  Match the column and find out the correct combination

Column –I      Column –II

(P) Keratin    (i) co-enzyme

(Q) ATP        (ii) pyrimidline

(R) Cytosine (iii) polynucleotide

(S) NAD        (iv) Purine

(T) Guanine   (v) polypeptide

• a) P-v, Q-iii, R-ii, S-i, T-iv
• b) P-iii, Q-v, R-i, S- ii, T-iv
• c) P-v, Q-iii, R-iv, S-I, T-ii
• d) P-v, Q-i, R-ii, S-iii, T-iv

Answer:  P-v, Q-iii, R-ii, S-i, T-iv

Question: Which are proportionally more compounds in all RNA’s?

• a) r-RNA
• b) t-RNA
• c) m-RNA
• d) None of these

Answer: r-RNA

Question: Which is the special function of t-RNA?

• a) An adapter for attaching amino acid to m-RNA template during Protein synthesis
• b) Carries the coded genetic information in to the cytoplasm
• c) Do protein synthesis
• d) Pick up code for m-RNA and bring it to r-RNA

Answer: An adapter for attaching amino acid to m-RNA template during Protein synthesis

Question: Which is the part of DNA molecules that varies among DNA molecule

• a) Nitrogen base
• b) Pentose sugar
• c) phosphate
• d) None of these

Answer: Nitrogen base

Question: which kind of arrangement lies in the two polynucleotide chain of DNA?

• a) Antiparallel and complementary
• b) Independent
• c) parallel and complementary
• d) None of these

Answer: Antiparallel and complementary

More Questions.................................

Question: If the one base chain sequence of DNA is ACGTTGG then what will be the base Sequence ofopposite chain

• a) TGCAACC
• b) CATGGTT
• c) GTAGGAA
• d) TAGCCGG

Answer: TGCAACC

Question: What is ATP?

• a) Pentose sugar + adenine + 3 molecule phosphate
• b) Hexose sugar + adenine + 3 molecule phosphate
• c) Amino acid + adenine + 3 molecule phosphate
• d) None of these

Answer: Pentose sugar + adenine + 3 molecule phosphate

Question: What is enzyme?

• a) Chemicals which act as biological catalysts
• b) All proteins which are in all living cell
• c) All amino acid which are in polypeptide chain
• d) None of these

Answer: Chemicals which act as biological catalysts

Question: Which of the following is not true for enzyme

• a) Used up in the biochemical reaction
• b) Affected by the change in temperature
• c) Lowers the activation energy level
• d) Water soluble and colloidal in nature

Answer: Used up in the biochemical reaction

Question: What is Ribozymes?

• a) Some nucleic acids that behave like enzyme
• b) only protein
• c) Only nucleic acids
• d) More than one Ribosome

Answer: Some nucleic acids that behave like enzyme

Question: Enzymes are present in which parts of plant?

• a) in all the living cell of plant body
• b) Only in fruits
• c) Only in leaves
• d) In apical meristem of root and shoot

Answer: in all the living cell of plant body

Question: What is an apoenzyme?

• a) Protein
• b) Amino acid
• c) metallicions
• d) Carbohydrates

Answer: Protein

Question: What is co – enzyme?

• a) Often a vitamin
• b) Always a protein
• c) always a amino acid
• d) Often a protein

Answer: Often a vitamin

Question: Find out the correct function of co-enzyme?

• a) In association with apoenzyme and make it effective
• b) Independently of the apoenzyme
• c) In association with any protein and make it effective
• d) None of these

Answer: In association with apoenzyme and make it effective

Question: Which one property is not true for enzyme?

• a) All enzymes are bidirectional
• b) They are not destroyed
• c) It is amphoteric in nature
• d) It effective for one reaction is not useful in another reaction

Answer: All enzymes are bidirectional

Question: The rate of most of enzyme catalyzed reaction changes with PH as the PH Increases this rate?

• a) Reaches a maximum
• b) Decreases
• c) Reaches a minimum
• d) Increases

Answer: Reaches a maximum

Question: Near freezing point an enzyme is

• a) Inactivated
• b) Destroyed
• c) Denatured
• d) Slightly activated

Answer: Inactivated

Question: A temperature change from 30^o C to 50^o C the rate of enzyme actively will:

• a) First increase and then decrease
• b) Increase
• c) Decrease
• d) First decrease and then increase

Answer: First increase and then decrease

Question: An enzyme brings about

• a) Decrease in activation energy level
• b) Activation energy level
• c) Increase in reaction time
• d) None of these

Answer: Decrease in activation energy level

Question: Enzymes are polymers of:

• a) Amino acid
• b) Nucleotides
• c) Phosphate
• d) Fatty acid

Answer: Amino acid

Question: Which one is not correct for enzyme?

• a) All proteins are enzymes
• b) They all are colloidal
• c) They all are biocatalysts
• d) They all are proteins

Answer: All proteins are enzymes

Question: Inorganic catalyst recognized what when it attached an enzyme?

• a) Activator
• b) Co- enzyme
• c) Inhibitor
• d) Apoenzyme

Answer: Activator

Question: At which place the substrate combines with the enzymes:

• a) Active site
• b) inactive site
• c) Common site
• d) Gap site

Answer: Active site

Question:  Fill it E + S ________

• a) E-S complex
• b) E-S
• c) product
• d) enzyme

Answer: E-S complex

Question: Enzyme and substrate complementary each other such as

• a) Lock & key
• b) Pen & Paper
• c) Pencil & eraser
• d) None of these

Answer: Lock & key

Question: Which one of the following chemical is classified as an enzyme?

• a) Sucrase
• b) Galactose
• c) Cellulose
• d) Try glyceride

Answer: Sucrase

Question: In the cell digestive enzymes are mostly in which cell organells?

• a) Lysosomes
• b) Mitochondria
• c) vacuoles
• d) Ribosome

Answer: Lysosomes

Question: Enzymes are named after their substrate adding suffix

• a) — ase
• b) —- In
• c) — ose
• d) — on

Answer: — ase

Question: The enzyme which removes hydrogen from the substrate is known as:

• a) Dehydrogenase
• b) Hydrolyses
• c) Oxido-reductas
• d) Hydrogenase

Answer: Dehydrogenase

Question: The product is realized from which site of the enzyme?

• a) active site
• b) Simple site
• c) Complex site
• d) Inactive site

Answer: active site

Question:  What ‘A’ and ‘B’ indicates in the given figure (reaction)?

• a) A= ES complex B=E
• b) A= ES complex B=S
• c) A=S B=E
• d) A= EP complex, B=E

Answer:  A= ES complex B=E

Question: which of the following enzyme would correct glucose in to glucose-6-phosphate

• a) Trans ferase
• b) Isomerases
• c) Lyases
• d) Hydrolyses

Answer: Trans ferase

Question:

• a) Hexokinase
• b) Glucose dehydrogenase
• c) Glucose isomerase
• d) Glucose oxidase

Answer: Hexokinase

Question: which enzyme would change glucose – 6 phosphate to fructose – 6 phosphate?

• a) Isomerase
• b) Transferase
• c) Lyases
• d) glucose phosphatase

Answer: Isomerase

Question: which enzyme involved in hydrolysis of maltose to glucose?

• a) maltase
• b) Galactose
• c) Lyases
• d) Synthetase

Answer: maltase

Question: the enzyme which also known as scissor?

• a) Lyases
• b) Ligarer
• c) Isomerases
• d) Trans ferasess

Answer: Lyases

Question: which enzyme involved in conversion of a molecular in to an isomer?

• a) Isomerase
• b) Transferase
• c) Synthetase
• d) Lyases

Answer: Isomerase

Question: The enzyme which break up fructose 1, 6 biphosphate in to fructose phosphates known?

• a) Aldolase
• b) Phosphatase
• c) Fructose phosphase
• d) Fructose

Answer: Aldolase

Question: Which enzyme is needed to digest food reserve in pea seeds?

• a) Proteases
• b) Amylase
• c) Nuclease
• d) Lipase

Answer: Proteases

Question: The best example of extra cellular enzyme is?

• a) Digestive enzyme
• b) Nuclease
• c) Dehydrogenase
• d) Lipase

Answer: Digestive enzyme

Question: A non-protein component of enzyme is called?

• a) Co-factor
• b) Activator
• c) Co-enzyme
• d) Inhibitor

Answer: Co-factor

Question: Which is an enzyme that joins acetic acid to Co A with the help of energy?

• a) Acetyl co. A Synthetase
• b) Acetic acid co. A Synthetase
• c) Ligases
• d) None of these

Answer: Acetyl co. A Synthetase

Question: Carbonic anhydrase is activated in the presence of which elements?

• a) Zn
• b) Ca
• c) Mn
• d) Mb

Answer: Zn

Question: Vanadium is necessary for the activation of which enzyme?

• a) Nitrogenase
• b) Maltase
• c) Kinase
• d) Enolase

Answer: Nitrogenase

Question: Find out the correct group of co. factor which is activated enolase?

• a) Mg, Mn, Zn
• b) Mg, Co, Ca
• c) Co, Ca, V
• d) Mn, Zn, V

Answer: Mg, Mn, Zn

Question: Which one is not a co. Enzyme?

• a) ADP
• b) FAD
• c) NADP
• d) NAD

Answer: ADP

Question: Find out the correct group of enzyme which is activated by calcium?

• a) Nitric oxide Synthetase, protein phosphatase , adenylkinase
• b) Acetyl co. A Synthetase, fructose isomerase protein phosphatase
• c) Succinic dehydrogenase, Cytochrome oxidase, Aldolase
• d) None of these

Answer: Nitric oxide Synthetase, protein phosphatase , adenylkinase

Question: Which of the following sets is not co enzyme?

• a) NAD, FAD, ATP
• b) NAD, NHDP,FMN
• c) V, Ca, Mg
• d) Fe, Cu, Zn

Answer: NAD, FAD, ATP

Question: Co enzyme differs from prosthetic group because:-

• a) They attached apoenzyme with loosely bound
• b) They do not attached with apoenzyme
• c) They deactivates the enzymes
• d) They activates the enzymes

Answer: They attached apoenzyme with loosely bound

Question: Maltose is composed in which form

• a) Glucose + fructose
• b) Glucose + Ribose
• c) Glucose + Glucose
• d) Glucose + galactoge

Answer: Glucose + fructose

Question:

S: protein carry out many functions in living organisms

A: all enzymes are made up of proteins

R: they are responsible for maintenance of proper rates of biochemical reaction in cell

• a) S,A&R are true and R&A are the correct explanation of S
• b) S&A are true but R is false
• c) S is true but A&R both are false
• d) S,A&R are true but R&A are not the correct explanation of S

Answer: S,A&R are true and R&A are the correct explanation of S

Question:

A: peptide bond is formed between the

–COOH group of one amino acid and

–NH₂ group of another amino acid molecule

R: a module of H₂O is added in this process.

• a) A true R false
• b) Both A&R are true and R is the correct explanation of A
• c) Both A&R are true and R is the correct explanation of A
• d) None of these

Answer: A true R false

Question:

A: some protein transport nutrients across all membrane

R: the variation in the different species of living organisms is due to the variation in their bimolecular

• a) Both A&R are true but R is not the correct explanation of A
• b) Both A&R are true and R is the correct explanation of A
• c) A true R false
• d) both A & R are false

Answer: Both A&R are true but R is not the correct explanation of A

Question:

A: Dipeptide is formed through the union of two similar or dissimilar aminoacid molecule

R: Dipeptide bond is formed between the –COOH group of one amino acid and -NH₂ group of another amino acid molecule

• a) A true R false
• b) both A & R are false
• c) Both A&R are true but R is not the correct explanation of A
• d) Both A&R are true and R is the correct explanation of A

Answer: A true R false

Question:

A: Conjugated protein are responsible for movements

R: Protein become associated with other than amino acids are known as Conjugated protein

• a) both A & R are false
• b) A true R false
• c) Both A&R are true but R is not the correct explanation of A
• d) Both A&R are true and R is the correct explanation of A

Answer: both A & R are false

Question:

A: Each enzyme has an effect on a particular reaction

R: Glucose and galactose is the product of hydrolysis of lactose in presence of The lactose

• a) Both A&R are true and R is the correct explanation of A
• b) Both A&R are true but R is not the correct explanation of A
• c) A true R false
• d) both A & R are false

Answer: Both A&R are true and R is the correct explanation of A

Question: Protein conjugated to carbohydrate is

• a) Glycoprotein
• b) Lecithoprotein
• c) Lipoprotein
• d) Metalloprotein

Answer: Glycoprotein

Question: DNA nucleotides are attached with

• a) covalent bonds
• b) Electrovalent bonds
• c) Vander Waal’s force
• d) Hydrogen bonds

Answer: covalent bonds

Question: Most abundant organic compound on earth is

• a) Protein
• b) Cellulose
• c) Lipid
• d) Steroid

Answer: Protein

Question: Which one is a simple protein?

• a) Albumin
• b) Nucleoprotein
• c) Lipoprotein
• d) Glycoprotein

Answer: Albumin

Question: Bond formed between the first phosphate group and adenosine in ATP is

• a) Phosphoester bond
• b) Adenophosphate bond
• c) Nitrophosphate bond
• d) Phosphoanhydride bond

Answer: Phosphoester bond

Question: Nucleotides are building blocks of nucleic acids each nucleotide is a composite Molecule formed by

• a) base-sugar-phosphate
• b) (base-sugar-phosphate)n
• c) base-sugar-OH
• d) sugar-phosphate

Answer: base-sugar-phosphate

Question: Which one is not a nucleotide?

• a) Lysine
• b) Thymine
• c) Guanine
• d) Adenine

Answer: Lysine

Question: Which one is a molecule of ATP?

• a) nucleotide
• b) deoxyribose
• c) Nucleoside
• d) Nucleosome

Answer: nucleotide

Question: t-RNA is a polymer of

• a) Ribonucleotide
• b) Deoxyribonucleoside
• c) ribonucleoside
• d) deoxyribotide

Answer: Ribonucleotide

Question: Which one is Purine base of RNA?

• a) Guanine
• b) Thymine
• c) Uracil
• d) Cytosine

Answer: Guanine

Question: Enzymes are formed by conjunction of which molecule?

• a) amino acid
• b) carbon
• c) glucose
• d) Fatty acid

Answer: amino acid

Question: Co-enzyme means

• a) Vitamin
• b) Metal
• c) Inorganic compound
• d) None of these

Answer: Vitamin

Question: Enzymes in boiling water

• a) Denatured
• b) Inactive
• c) Uneffective
• d) Destroyed

Answer: Denatured

Question: Which one is the contractile protein

• a) keratin
• b) tropomycin
• c) Collagen
• d) globular

Answer: keratin

Question: How many nucleotide present in DNA molecule which consist pair of 2000 N₂ base?

• a) 10,000
• b) 5,000
• c) 2,000
• d) 40,000

Answer: 10,000

Question: Which one is not gain by the hydrolysis of nucleoside?

• a) Phosphoric acid
• b) Purine
• c) Pentose sugar
• d) Pyrimidine

Answer: Phosphoric acid

Question: Enzyme by natured:

• a) polypeptide
• b) carbohydrate
• c) vitamin
• d) Fatty acid

Answer: polypeptide

Question: The pair of nitrogen base in DNA is conjugated with

• a) Hydrogen bond
• b) Glycosidic bond
• c) Peptide bond
• d) Disulphide bond

Answer: Hydrogen bond

Question: Disulphide bond

• a) Hydrogen bond
• b) Glycosidic bond
• c) Peptide bond
• d) Disulphide bond

Answer: Hydrogen bond

Question: The prosthetic group which is in the structure of enzyme

• a) It contain organic or inorganic structure
• b) tightly binding
• c) Loosely combining
• d) only inorganic

Answer: It contain organic or inorganic structure

Question: Enzyme speed up rate of reaction by

• a) Covering activation energy
• b) Changing equilibrium of reaction
• c) Forming reaction product complex
• d) Combining with product

Answer: Covering activation energy

Question: The catalytic efficiency of two different enzymes can be compared by the

• a) The Km value
• b) The PH qutimum value
• c) Formation of the product
• d) Molecular size of the enzyme

Answer: The Km value

Question: Which of the following cell organelles is rich in catabolic enzyme

• a) Mitochondria
• b) Golgicomplex
• c) chloroplast
• d) Ribosome

Answer: Mitochondria

Question: Enzyme which help in electron transfer are:

• a) Cytochrome
• b) Isomerase
• c) Protease
• d) All of above

Answer: Cytochrome