DNA

Q.

Semi-discontinuous mode of DNA replication was discovered by

1. Meselson and Stahl

2. Watson and Crick

3. Hershey and Chase

4. Okazaki and Okazaki

Q.

Which one is the correct base pairing for DNA molecule?

1. Adenine-Thymine

2. Thymine-Guanine

3. Cytosine- Uracil

4. Thymine- Uracil

Q. The sugar present in DNA is called .

1. ribose
2. deoxyribose
3. mannose
4. glycan

Q.

Explain the structure of DNA and RNA nucleotides.

Q. Which of the following is NOT a part of the nucleotide of DNA?

1. Deoxyribose sugar
2. Phosphate
3. Uracil
4. Adenine

Q.

If a DNA has 20% adenine then what will be the percentage of guanine , show it with necessary calculations. Options are ---

A. 20%

B. 30%

C. 40%

D. 50%

Q.

What is referred to a satellite chromosomes?

Q.

What is triplet codon?

Q.

Lac operon is called negative regulation because__________

1. The structural genes can digest lactose

2. None of these

3. The repressor protein inhibits the transcription of structural genes.

4. It gets active only in pressure of lactose

Q.

What are the basic units of heredity?

Q.

Given below is a schematic diagram of a portion of DNA.
(a) How many strands are shown in the diagram?
(b) How many nucleotides have been shown in each strand? (c) Name the parts numbered 1, 2, 3, 4 and 5 respectively. (d) Name the DNA unit constituted by the parts 1, 2 and 3 collectively.

Q.

What Is Central Dogma In Molecular Biology?

Q.

How do prokaryotes organize DNA?

Q.

Pyrimidine bases present in DNA are__________.

Q.

What are the 3 main functions of nucleic acids?

Q.

The pitch of the double-stranded B-DNA helix is

1. 34 A

2. 3.4 A

3. 3.4 nm

4. Both A and C

Q.

The Location or Position of a Gene on a Chromosome is called _____ .

1. Node

2. Point

3. Locus

4. Space

Q. Passing of characters from one generation to another is called .

1. heredity
2. reproduction
3. fertilisation

Q.

Which one of the following is used as a vector for cloning genes into higher organisms?

1. Retrovirus

2. Baculovirus

3. Salmonella typhimurium

4. Rhizopus nigricans

Q.

What is meant by peptones and peptides

Q.

Organelle without a cell membrane is known as what?

Q.

Nucleic acids are polymers of nucleotides.

1. Nucleotides

2. Amino acids

Q.

In DNA base pairing, adenine always pairs with

1. Guanine

2. Thymine

3. Uracil

4. Cytosine

Q.

What is a chromatin network?

Q. In a DNA, the percentage of thymine is 20 %, then what is the percentage of guanine?

1. $30\%$
2. $20\%$
3. $40\%$
4. $60\%$

Q.

The triplets of bases in DNA that code for amino acids are called

1. Codons

2. Anticodons

3. Nitrogenous bases

4. Nucleotides

Q.

How many stages are there in DNA replication?

Q. Which is not correct according to Chargaff's rule?

1. $A+T=C+G$
2. Purines=Pyrimidines
3. $A+G=C+T$
4. $\frac{A+G}{C+T}=1$

Q.

Sutton and Boveri used chromosome movement during cell division to explain Mendel’s laws.

1. True

2. False

Q. In nucleoside, where is the nitrogenous base attached to the pentose sugar?

1. Carbon-1' of pentose sugar
2. N-1 and N-9
3. Both B and C
4. Carbon-5' of pentose sugar