Unit 1 Chapter 2 (1st Secondary) Biology

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Unit 1 Chapter 2 (1st Secondary) Biology - Quiz

. Proteins and Nucleic acids

Questions and Answers

1.

A nucleotide of DNA may contain ________.
- A.
  
  Ribose, uracil, and a phosphate group
- B.
  
  Deoxyribose, uracil, and a phosphate group
- C.
  
  Deoxyribose, thymine, and a phosphate group
- D.
  
  Ribose, thymine, and a phosphate group
2.

In double helix of DNA, the two DNA strands are .....
- A.
  
  Coiled around a common axis
- B.
  
  Coiled around each other
- C.
  
  Coiled differently
- D.
  
  Coiled over a cellulosic sheath.
3.

A segment of DNA has 120 adenine and 120 cytosine bases. The total number of nucleotides present in the segment is .....
- A.
  
  120
- B.
  
  240
- C.
  
  360
- D.
  
  480
4.

All of the following are true for protein denaturation except that it ……
- A.
  
  Is a shape change
- B.
  
  Is always irreversible
- C.
  
  May be caused by a pH change
- D.
  
  Could result from a temperature change
5.

In the formation of a macromolecule, what type of bond would join two amino acid subunits?
- A.
  
  Ionic bond
- B.
  
  Bond between two carbon atoms
- C.
  
  Hydrogen bond
- D.
  
  Peptide bond
6.

Assuming they all had the same number of carbon atoms, which of the following has the most C-H bonds?
- A.
  
  Unsaturated fat
- B.
  
  Dipeptide
- C.
  
  Disaccharide
- D.
  
  Saturated fat
7.

Dehydration and hydrolysis reactions involve removing or adding ______ to macromolecule subunits.
- A.
  
  C and O
- B.
  
  C and H
- C.
  
  COOH and H
- D.
  
  OH and H
8.

What type of macromolecule carries out catalysis in biological systems?
- A.
  
  Proteins called enzymes
- B.
  
  Carbohydrates called starches
- C.
  
  Lipids called steroids
- D.
  
  Nucleic acids called DNA
9.

Polymerization reactions in which polysaccharides are synthesized from monosaccharides or proteins are synthesized from amino acids. These reactions …...
- A.
  
  Are hydrolysis reactions.
- B.
  
  Result in the formation of water.
- C.
  
  Release energy.
- D.
  
  All of the above.
10.

Which element occurs in nucleic acids?
- A.
  
  Manganese
- B.
  
  Calcium
- C.
  
  Phosphorus
- D.
  
  Sulfur
11.

Nucleotides have a nitrogenous base attached to a sugar at the …...
- A.
  
  1' carbon
- B.
  
  2' carbon
- C.
  
  3' carbon
- D.
  
  5' carbon
12.

Which of the following is correct with respect to the amino acid composition of proteins?
- A.
  
  At least one of the 20 different amino acids is common in all proteins.
- B.
  
  Proteins with different functions usually differ significantly in their amino acid composition.
- C.
  
  Proteins with the same molecular weight have the same amino acid composition.
- D.
  
  The average molecular weight of an amino acid in a protein increases with the size of the protein.
13.

Which part of the amino acid gives it uniqueness?
- A.
  
  Amino group
- B.
  
  Carboxyl group
- C.
  
  Alkyl group
- D.
  
  Peptide bond
14.

One of the following statements is not true for a dipeptide molecule ......
- A.
  
  Two alkyl (R) groups
- B.
  
  Two amino acids and one peptide bond.
- C.
  
  Two free carboxylic groups and two free amino groups.
- D.
  
  Amino acids are linked by a C-N bond.
15.

Protein molecules are mostly made up of ………
- A.
  
  Carbon, hydrogen, oxygen and nitrogen
- B.
  
  Carbon, hydrogen, carbon monoxide and nitrogen
- C.
  
  Carbon, hydrogen, oxygen and methane
- D.
  
  Carbon, hydrogen, oxygen and sulpher
16.

Each protein molecule is made up of …..
- A.
  
  Carbohydrates
- B.
  
  Fatty acids
- C.
  
  Amino acids
- D.
  
  Nucleotides
17.

There are about ……. amino acids in all which, can be linked together in different ways to make numerous protein molecules.
- A.
  
  40
- B.
  
  20
- C.
  
  25
- D.
  
  30
18.

The protein molecules inside the body are used for …....
- A.
  
  Making new cells
- B.
  
  Fighting microbes
- C.
  
  Lowering heat of activation of the biochemical reactions
- D.
  
  All of the above
19.

The DNA …….
- A.
  
  Store information for controlling all cellular activities.
- B.
  
  Synthesizes fats.
- C.
  
  Produces energy.
- D.
  
  All of the above.
20.

The DNA consists of two …….. coiled strands.
- A.
  
  Spherically
- B.
  
  Spirally
- C.
  
  Angularly
- D.
  
  Cubically
21.

A nucleotide has ……….
- A.
  
  Nitrogenous base + phosphoric acid + sugar
- B.
  
  Two sugar molecules + phosphoric acid
- C.
  
  Three phosphoric acid molecules
- D.
  
  Two phosphoric acid + nitrogenous base
22.

In a DNA molecule, adenine binds with thymine by a …..
- A.
  
  Single bond
- B.
  
  Double bond
- C.
  
  Triple bond
- D.
  
  Ionic bond
23.

In a DNA molecule, cytosine binds with guanine by a ……
- A.
  
  Single bond
- B.
  
  Double bond
- C.
  
  Triple bond
- D.
  
  Ionic bond
24.

Which of the following contain nitrogen and sulphur?
- A.
  
  Nucleic acids
- B.
  
  Carbohydrates
- C.
  
  Lipids
- D.
  
  Proteins
25.

Which of the following can be used as short-term energy storage?
- A.
  
  Carbohydrates
- B.
  
  Triglycerides
- C.
  
  ATP
- D.
  
  Proteins

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