Unit 1 Chapter 2 (1st Secondary) Biology
. Proteins and Nucleic acids
- 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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