1.Which particular nitrogenous base is present in DNA and not in RNA?:
a)Adenine
b)Thymine
c)Uracil
d)Cytosine
Answer
Ans.(b)
2.Which monomer unit after polymerization forms proteins?:
a)Monosaccharides
b) Nucleotides
c)Fatty acids
d) Amino acids
Answer
Ans.(d)
3.Number of fatty acid residues found in one molecule of fat is:
a)1
b)2
c)3
d)4
Answer
Ans.(c)
4.An enzyme that brings about structural changes of a compound without altering its molecular weight is:
a)Diastase
b)Ligase
c)Lyase
d)Isomerase
Answer
Ans.(d)
5.Which is the most abundant enzyme on the earth?
a)Catalase
b)Invertase
c)Rubisco
d)Nitrogenase
Answer
Ans.(c)
6.An organic substance bound to an enzyme and essential for its activity is called:
a)coenzyme
b)holoenzyme
c)apoenzyme
d)isoenzyme
Answer
Ans.(a)
7.The scientist who coined the term enzyme is:
a)Kuhne
b)Berzilius
c)Bloor
d)Sumner
Answer
Ans.(a)
8.Which of the following does not contain DNA:
a)Sperm
b)Ovum
c)Mature RBCs
d)Chloroplast
Answer
Ans.(c)
9. Cytoskeleton is made up of:
a)Cellulosic microfibrils
b)Proteinaceous filaments
c)Calcium carbonate filaments
d)callose deposits
Answer
Ans.(b)
10. An elaborate network of filamentous proteinaceous structures present in the cytoplasm which helps in the maintenance of cell shape is called:
a)thylakoid
b) endoplasmic reticulum
c)plasmalemma
d)cytoskeleton
Answer
Ans.(d)
11.The plasma memebrane consists mainly of:
a)proteins embedded in a carbohydrate bilayer
b)phospholipids embedded in a protein bilayer
c)proteins embedded in a phospholipid bilayer
d)proteins embedded in a polymer of glucose molecules
Answer
Ans.(c)
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