Class 12 Chemistry Chapter 14 Biomolecules MCQs | Class 12 Chemistry Chapter 14 Biomolecules Objective Type Questions and Answers

Sports GK Questions and Answers 2024 (Latest Updated)

Awards & Honours GK Questions 2024 (Latest Updated)

Questions
1 Platelet aggregation:
A is initiated at the site of an injury by conversion of fibrinogen to fibrin
B is inhibited in uninjured blood vessels by the secretion of prostacyclin by intact vascular endothelium
C causes morphological changes and a release of the vasodilator serotonine
D is inhibited by the release of ADP and thromboxane A2

Answer:is inhibited by the release of ADP and thromboxane A2
2 The cones of the retina:
A are responsible for colour vision
B are much more numerous than rods
C have red, blue and green light- sensitive pigments that differ because of small difference in the retinal prosthetic group
D do not use transducin in signal transduction

Answer: are responsible for colour vision
3 The nerve impulse that initiates muscular contraction
A begins with the binding of acetyl choline to receptors in the sarcoplasmic reticulum
B causes both the plasma membrane and the transverse tubules to undergo hyperpolariation
C causes opening of calcium channels which lead to an increase in calcium contreation within the sarcomere
D prevents sodium entering the sarcomere

Answer: causes opening of calcium channels which lead to an increase in calcium contreation within the sarcomere
4 When a muscle contracts, the
A Transverse tubules shorten, the myofibrils and sarcoplasmic reticulum close together
B Thin filaments and thick filaments of the sarcomere shorten
C Light chains dissociate from the heavy chains of myosin
D H bands and I bands of the sarcomere shorten because the thin filaments and thick filaments side past each other

Answer:H bands and I bands of the sarcomere shorten because the thin filaments and thick filaments side past each other
5 Lysis of a fibrin clot:
A is an equibrium wwith formation of the clot
B begins when plasmin binds to the clot
C requires the hydrolysis of plasminogen into heavy and light chains
D requires conversion of plasminogen by tissue plasminogen activator

Answer: requires conversion of plasminogen by tissue plasminogen activator
6 ATP concentration is maintained relatively constant during muscle contraction by
A increasing the metabolic activity
B the action of adenylate kinase
C theaction of creatne phosphokinase
D all of the above

Answer: all of the above
7 4-hydroxy proline is present in
A Collagen
B Plant cell wall
C Keratin
D Both plant cell wall and collagen

Answer: Both plant cell wall and collagen
8 Peptide bonds between amino acids are highly stable and have a half-life of seven years in intracellular condition. This is due to
A High activation energy required for hydrolysis
B Low activation energy required for hydrolysis
C Peptide bond is a covalent bond
D Peptide bond is rigid and planar

Answer:High activation energy required for hydrolysis
9 Tri-peptide consists
A 3 amino acids and 3 peptide bonds
B 2 amino acids and 3 peptide bonds
C 3 amino acids and 2 peptide bonds
D 3 amino acids and 4 peptide bonds

Answer:3 amino acids and 2 peptide bonds
10 All the following statements are true except
A Ornithine and citrulline are uncommon aminoacids
B Ornithine is an intermediates in Urea cycle
C Ormithine and citrulline are uncommon amino acids present in many proteins
D Both ornithine and citrulline are intermediates in urea cycle

Answer: Ormithine and citrulline are uncommon amino acids present in many proteins
11 The characteristic strong absorbance of 280nm of proteins is due to
A All amino acids can absorb at 280nm
B Only Tryptophan and tyrosine can absorb at 280 nm
C Tryptophan is responsible for the absorbance
D Tryptophan, tyrosine and phenylalanine can absorb at 280 nm

Answer: Tryptophan, tyrosine and phenylalanine can absorb at 280 nm
12 The formation of cystine occurs at
A ER
B Golgi
C Cytosol
D Mitochondria

Answer: ER
13 Which of the following interaction contributes most in protein folding

protein folding

A Covalent bond
B Ionic bond
C Hydrophobic interaction
D Vander walls interaction

Answer:Hydrophobic interaction
14 Which of the following aminoacid has pKa near neutrality
A Tryptophan
B Arginine
C Histidine
D Asparagine

Answer: Histidine
15 Desmosine is an unusual amino acid found in
A Myosin
B Troponin
C Actin
D Elastin

Answer: Elastin
16 How many small peptides are formed upon cleavage by trypsin if a protein has 5 lysine residues
A 4
B 5
C 6
D 7

Answer:6
17 EF-1α and EF-Tu are
A Analogs
B Homologs
C Paralogs
D Syllogs

Answer:Homologs
18 All the statements regarding peptide bond are true except
A Peptide bond is a co-valent bond
B Peptide bond is rigid and planar
C Peptide bond has partial double bond character
D Peptide bond is formed by non-condensation reaction

Answer:Peptide bond is formed by non-condensation reaction
19 Αlpha-helix has
A 3.6 residues/turn and is a right handed helix
B 3.8 residues/turn and is a right handed helix
C 3.6 residues/turn and is a left handed helix
D 3.8 residues/turn and is a left handed helix

Answer: 3.6 residues/turn and is a right handed helix
20 Which of the following amino acids are rarely present in alpha helix
A Glycine and proline
B Proline and tryptophan
C Tryptophan and glycine
D Proline only

Answer: Glycine and proline

Random GK Questions

Q. How many members can be nominated to both the Houses of the Parliament by the President?
Q. Who was the India's first woman Grandmaster in Chess?
Q. Escape from confinement negligently suffered by a public servent is dealt under :
Q. Which of the following does not form a part of the foreign exchange reserve of India?
Q. Phytotron is a facility to
Q. Purana Qila was constructed during the reign of :

Chapters

Assam Direct Recruitment Test Series

Teacher Eligibility Test

Assam Direct Recruitment Test Series