Nucleic Acids

Q.

Why is DNA replication important?

Q.

What are some of the elements found inside nucleic acids?

Q. Which of the following is not a criteria used to classify satellite DNA?

1. Base composition
2. Length of segment
3. Number of repetitive units
4. Cell from where DNA is extracted

Q. Which of the following bonds are not a part of a deoxyribonucleotide?
A. Glycosidic bond
B. Phosphoester bond
C. Phosphodiester bond
D. Hydrogen bond

Choose the correct option

1. A and B
2. C and D
3. B and D
4. A and D

Q.

What are the significance of DNA replication?

Q. Which of the following is complementary to the DNA sequence 5' ATTGCACCGG 3' ?

1. 5' CCGGTGCAAT 3'
2. 5' TAACGTGGCC 3'
3. 3' CCGGTGCAAT 5'
4. 3' GGCCACGTTA 5'

Q. Which of the following statements regarding DNA is incorrect?

1. The two strands run antiparallelly
2. Adenine pairs with thymine through three H-bonds
3. Purine always pairs with pyrimidine
4. Guanine pairs with cytosine through three H-bonds

Q.

What are DNA damaging agents?

Q. The basic unit of a nucleic acid is

1. Nucleotide
2. Pentose sugar
3. Nucleoid
4. Nucleoside

Q. What is not true for genetic code?

1. It is unambiguous
2. A codon in mRNA is read in a noncontiguous fashion
3. It is nearly universal
4. It is degenerate

Q. How are the two strands of DNA positioned with respect to each other in the double helix?

1. They run parallel to each other.
2. They run antiparallel to each other.
3. They are perpendicular to each other.
4. They intersect each other at an angle.

Q. Write the differences between DNA and RNA.

Q.

The primary structure of a protein molecule has

(a) two ends (b) one end (c) three ends (d) no ends

Q. Read the following statements and select the correct option.

(i) Har Gobind Khorana developed a method for synthesising RNA molecules with defined sequences.

(ii) Marshall Nirenberg developed a cell-free system to synthesise proteins and that helped to decipher the code.

(iii) A classic example of point mutation is sickle cell anaemia disease.

1. Statements (i) and (ii) are true, but statement (iii) is false
2. Statements (i) and (ii) are false, but statement (iii) is true
3. Statements (ii) and (iii) are true, but statement (i) is false
4. All statements are true

Q.

Which of the following is the amino group?

1. COOH

2. NH₂

3. CH₄

4. OH^-

Q. The term used to describe the process by which DNA is copied to produce two daughter DNA molecules, is _____.

1. Replication

2. Transcription

3. Translation

4. Duplication

Q.

Which of the following is not present in a nucleotide

1. Tyrosine

2. Guanine

3. Cytosine

4. Adenine

Q. Which of these are nucleic acids?

1. Carbohydrate
2. DNA
3. Lipid
4. RNA

Q. In eukaryotes which of the following is removed from initially transcribed RNA before it is transported to the cytoplasm for translation?

1. Ribosome binding site
2. Intron
3. $3^{\prime }$ Poly A tail
4. $5^{\prime }$ cap

Q. Wat r regulatory genes ?

Q. DNA is a polymer of

1. Proteins
2. Carbohydrates
3. RNA
4. Nucleotides

Q.

Does replication occur in all cells?

Q. DNA is similar to RNA because they both are _________.

1. Polymers of nucleotides
2. Similar sugars
3. Similar pyrimidine bases
4. Ability to replicate.

Q. DNA is similar to RNA because they both are _________.

1. polymers of nucleotides
2. similar sugars
3. similar pyrimidine bases
4. have the ability to replicate.

Q. Which of the following base pairings is/are possible?

1. Purine-Purine
2. Pyrimidine-Pyrimidine
3. Purine-pyrimidine
4. All of these

Q. DNA and RNA show similarity in having

1. Similar pyrimidines
2. Polymers of nucleotides
3. Double strands
4. Similar sugars.

Q. In a DNA fragment, there are 8 turns, with 40% of the bases are cytosine. What would be the total number of hydrogen bonds present in this DNA fragment?

1. 60
2. 224
3. 96
4. 192

Q. In protein synthesis process, genetic code is

1. singlet
2. doublet
3. triplet
4. quadruplet

Q.

The cross between $F_1$ individual with any one of the parents is called

1. Back cross

2. Reciprocal cross

3. Top cross

4. Test cross

Q. Structure of OSF4 molecule