This is the 3rd part of Biology, Science and Botany important MCQ that you should memorize to do better in Job tests and interviews. Botany important MCQ with answers are below. Moreover, check the first two parts which consist of important Botany questions with answers.
These Botany important Mcq are with answers that will help you to memorize them better.
1: What is the Chief source of energy on Earth?
a) Coal
b) Sun
c) Moon
d) Natural gas
Answer: Sun
2) The type of energy released by break down of chemical bonds of organic substances and capable of performing different works is:
a) Chemical energy
b) Kinetic energy
c) Potential energy
d) Mechanical energy
Answer: Kinetic energy
3) Energy changes in nature are of types:
a) Energy transfer
b) Potential energy
c) Mechanical energy
d) none of these
Answer: Mechanical energy
4) The stored energy which is not capable of doing work instantly is:
a) Kinetic energy
b) Potential energy
c) Mechanical energy
d) None of these
Answer: Potential energy
5) A Molecule of ATP is structurally similar to a molecule of :
a) Deoxyribonucleoride
b) Ribonucleotide
c) Protein
d) None of these
Answer: Ribonucleotide
6) The functioning of ATP was first discovered by:
a) Lohmann
b) Lipman
c) Clasius
d) Gibbs
Answer: Lipman
7: The branch dealing with transformation and use of energy by living cells is called:
a) Thermodynamics
b) Bioenergetics
c) Energetics
d) Entropy
Answer: Bioenergetics
8: Who is called the Father of the ATP cycle?
a) Clasius
b) Lohmann
c) Lipmann
d) Gibbs
Answer: Lipmann
9: A number of fundamental laws of thermodynamics are:
a) 1
b) 2
c) 3
d) 4
Answer: 2
10: The total amount of energy in the universe remains constant representing:
a) The first law of thermodynamics
b) the second law of thermodynamics
c) Both (A) and (b)
d) None of these
Answer: The first law of thermodynamics
11: Energy transfer through movement and collision of particles results in:
a) Decrease in entropy
b) Increase in entropy
c) No change in entropy
d) None of these
Answer: Increase in entropy
12: A thermodynamic property that is used to measure the degree of randomness or disorder of a system is :
a) Enthalpy
b) Entropy
c) Free energy
d) Redox potential
Answer: Entropy
13: The term entropy was first used by:
a) J.W Gibbs
b) R.Clasius
c) Lipmann
d) McMunn
Answer: R.Clasius
14: A system which has a continuous influx of energy directly or indirectly is called
a) closed system
b) Open system
c) Both (a) and (b)
d) None of these
Answer: Open system
15: Which system is in a steady state or homeostasis?
a) Open system
b) Closed system
c) Both (a) and (b)
d) None of these
Answer: Open system
16) For the occurrence of any process in the universe, there is:
a) Decrease in free energy and increase in entropy
b) Increase in free energy and decrease in entropy
c) Decrease in both free energy and entropy
d) Increase in both free energy and entropy
Answer: Decrease in free energy and increase in entropy
17: The combined concept of two laws of thermodynamics was given by:
a) R.Clasius
b) J.W.Gibbs
c) Lipmann
d) None of them
Answer: J.W.Gibbs
18: Thermodynamically favourable reactions are called:
a) Exogonic reactions
b) Endergonic reactions
c) Both (a) and (b)
d) None of these
Answer: Exogenic reactions
19: Respirations is an example of :
a) Exergonic reaction
b) Endergonic reaction
c) Thermodynamically unfavourable reactions
d) None of the above
Answer: Exergonic reaction
20: Which of the following acts as a bridge between exergonic and endergonic reactions of cells?
a) ATP
b) NADH2
c) ADP
d) AMP
Answer: ATP
21: Which of the following is not an energy carrier in a cell?
a) ATP
b) Creatine phosphate
c) GTP
d) Flavoproteins
Answer: Flavoproteins
22: How many high-energy bonds (pyrophosphate bonds) are present in a molecule of ADP?
a) 1
b) 2
3) 3
4) 4
Answer: 1
23: In the hydrolysis of ATP to ADP, the standard free energy change is:
a) -3.4 kcal/mol
b) -7.3 kcal/mol
c) -aa.5 kcal/mol
d) +7.3 kcal/mol
Answer: -7.3 Kcal/mol
24: In ATP molecule, the sugar present in
a) Ribose
b) Deoxyribose
c) Glucose
d) Xylose
Answer: Ribose
25: The energy currency of a cell is:
a) AMP
b) ADP
c) ATP
d) GTP
Answer: ATP
26: ATP of a cell is mainly stored in:
a) Cytosol
b) Mitochondria
c) Chloroplast
d) Nucleus
Answer: Mitochondria
27: Which of the electron carriers in the respiratory chain is not a prosthetic group associated with proteins?
a) Cytochrome
b) Ubiquinone
c) Flavoprotein
d) NAD
Answer: Ubiquinone
28: Cytochromes were discovered by:
a) D.Keilin
b) McMunn
c) Lipmann
d) Lohmaan
Answer: MCMunn
29: Which of the electron carriers is ubiquitous in nature?
a) COQ
b) Cytochromes
c) Flavoproteins
d) Fe-S Proteins
Answer: COQ
30: Which of the following electron carriers acts in sequence to carry electrons from ubiquinone to molecular O2?
a) NADH dehydrogenase
b) Iron-sulphur proteins
c) Cytochromes
d) None of these
Answer: Cytochromes
31: How many structural complexes of electron carriers occur on the inner mitochondrial membrane?
a) 1
b) 2
c) 3
d) 4
Answer: 4
32: Which of the electron carriers in the respiratory chain is capable of accepting and donating only a single electron?
a) Flavoproteins
b) Ubiquinone
c) Cytochromes
d) Iron-sulphur proteins
Answer: Iron-sulphur proteins
33: Genes act by producing enzymes, which was first advocated by:
a) Beadle and Tatum
b) Hans Krebs
c) J.W Gibbs
d) H.G. Khorana
Answer: Beadle and Tatum
34: Which of the following is not a high-energy compound?
a) ATP
b) GTP
c) Creatine Phosphate
d) AMP
Answer: AMP
35: Ribozyme differed from enzyme in:
a) Do not catalyze metabolic processes
b) Do not occur inside the cell
c) Are not proteins in nature
d) All of these
Answer: Are not protein in nature
36: Catabolic processes are:
a) Exergonic
b) Endergonic
c) Indpendent of energy
d) None of the these
Answer: Exergonic
37: During the formation of ATP from ADP, the source of phosphate is:
a) ATP
b) ADP
c) Glucose-PO4
d) Inorganic phosphate (IP)
Answer: Inorganic phosphate
38: ATP is:
a) Hormone
b) Protein
c) High energy phosphate compound
d) Reducing enzyme
Answer: High energy phosphate compound
39: For cell movements, chemical energy is changed into:
a) Mechanical energy
b) Electrical energy
c) Thermal energy
d) Light energy
Answer: Mechanical energy
40: Cytochromes occur in:
a) Mitochondria
b) Chloroplast
c) Both a and b
d) None of these
Answer: Both a and b
41: Cytochromes in plant cells function mainly as:
a) O2 acceptor
b) CO2 acceptor
c) Electron acceptor
d) H2O acceptor
Answer: Electron acceptor
42: How many cytochromes are involved in the electron transport chain?
a) Two
b) Four
c) Five
d) Six
Answer: Five
43: Which of the following is related to vitamin B2?
a) FMN/FAD
b) NAD
c) NADH
d) None of these
Answer: FMN/FAD
44: Cytochrome has:
a) Magnesium
b) Manganese
c) Copper
d) Iron
Answer: Iron
45: The high energy bonds of ATP are between:
a) C-C
b) C-O
c) C-N
d) O-P
Answer: O-P
46: The maintenance of internal favourable conditions by a self-regulated mechanism, in spite of the fact that there are changes in the environment, is known as:
a) Entropy
b) Enthalpy
c) Steady state
d) Homeostasis
Answer: Homeostasis
47: The bond formed between the first phosphate group and adenosine in ATP is:
a) Nitrophosphate bond
b) Adenophosphate bond
c) Phosphoanhybride bond
d) Phosphoester bond
Answer: Phosphoester bond
48: In the process of respiration, the potential energy stored in organic compounds is released in the form of:
a) Physical energy
b) Radiant energy
c) Kinetic energy
d) Chemical energy
Answer: Chemical energy
49: ATP molecules combine with carrier molecules and flow:
a) Along the concentration gradient
b) Against the concentration gradient
c) Both (a) and (b)
d) None of the above
Answer: Against the concentration gradient
50: Which yields ATP during the contraction of muscles?
a) Myoglobin
b) Creatine phosphate
c) Haemoglobin
d) Myosin
Answer: Creatine phosphate
These are the Botany important questions with answers. Keep checking the page for more important Botany questions.