Base Pairing

Q. The number of hydrogen bonds between adenine and thymine in a DNA molecule is

1. Three
2. Two
3. Four
4. Eight

Q.

Duplicated chromosomes remain attracted at a point termed centromere.

1. True
2. False

Q.

The pairing of homologous chromosomes is called:

1. Synapsis

2. Tetrad

3. Crossing over

4. Terminalisation

Q.

What is linkage. Give example?

Q. Crossing over between chromatids can occur only between:

1. Maternal chromosomes
2. Homologous chromosomes
3. Paternal chromosomes
4. Any two chromosome

Q.

During the pairing of chromosomes in meiosis, the.................... chromosomes come to lie side by side

Q.

Given below is a sample of the portion of a DNA strand with the complementary base sequence on the opposite strand. What does this sequence represent?
5'-GAATTC-3'
3'-CTTAAG-5'

1. Replication completed

2. Deletion mutation

3. A palindromic sequence of base pairs

4. Start codon at the 5' end

Q.

Crossing over between chromatids can occur only between

1. Homologous chromosomes

2. Paternal chromosomes

3. Maternal chromosomes

4. Any two chromosome

Q. What purines and pyrimidines basically are??

Q. If there are 10, 000 nitrogenous base pairs in a DNA then how many nucleotides are there?

1. 500
2. 10, 000
3. 40, 000
4. 20, 000

Q. Given below is a sample of portion of DNA strand giving the base sequence on the opposite strands. What is so special shown in it?
5'-GAATTC-3'
3'-CTTAAG-5'

1. Start codon at the 5' end
2. Deletion mutation
3. Palindromic sequence of base pairs
4. Replication completed

Q. what is genetic recombination

Q. Terminalization refers to

1. Separation of homologous chromosomes
2. Pairing of homologous chromosomes
3. Point of contact of homologous chromosomes
4. Mutation of homologous chromosomes

Q. _____ is a unit of DNA that is made up of one sugar molecule, one phosphate molecule, and one _____.

Q.

Write about occurence of homologous recombination.

Q. What do yo meant by Complementary base pairing

Q. In a segment of DNA 3.2 kilobases are present. If DNA segment has 820 adenine molecules, then what will be number of cytosine?

1. 1560
2. 1480
3. 780
4. 740

Q. If one strand, of double stranded DNA, consists of the sequence 3'-ATTCGTAC-5', then the complementary sequence must be

1. 5'-TAAGCATG-3'
2. 3'-TAAGCATG-5'
3. 5'-UAAGCAUG-3'
4. 5'-UAAGCATG-3'

Q. Match the appropriate pairs.

1. Triple bond
2. Binds to thymine
3. Purine base
4. Double bond

Q.

Choose the correct option for the numbers I to VI in the diagram given below:

1. I- Antigen binding site, II - Variable region , III- Light chain, IV-Constant region, V - heavy chain , VI - disulfide bonds

2. I - Variable region , II - Antigen binding site , III - Light chain , IV - Constant region, V- Heavy chain , VI-disulfide linkages

3. I- Variable region, II - Antigen binding site , III- Light chain, IV-Constant region, V - heavy chain , VI - disulfide bonds

4. I - Fc , II - Antigen binding site , III - Variable region , IV - Constant region, V- Heavy chain , VI-disulfide linkages

Q.

Identify the wrongly bonded pair(s) among the following with regard to DNA:

1. A=T

2. TA

3. G C

4. C=G

Q. Nucleotides are building blocks of nucleic acids. Each nucleotide is a composite molecule formed by

1. Base-sugar-OH
2. Base-sugar-phosphate
3. Sugar-phosphate
4. (Base-sugar-phosphate)${}_n$

Q. What is the difference between peptides and peptones?

Q.

Identify the wrongly bonded base pair(s) among the following with regard to DNA.

1. A=T

2. TA

3. G C

4. C=G

Q. A purine and a pyrimidine together form a __.

Q. Number of hydrogen bonds between A and T of DNA is

1. 3
2. 4
3. 2
4. 1

Q. Number of hydrogen bonds between A and T of DNA is

1. 4
2. 3
3. 2
4. 1

Q.

Identify the mismatched purine-pyrimidine pair among the following options.

1. Adenine - Thymine

2. Thymine - Adenine

3. Guanine - Cytosine

4. Thymine - Cytosine

Q.

Given the DNA sequence 5’ CCTAGAA 3’, the complementary strand would read:

1. 3’ GGATCTT 5’

2. 5’ GGATCTT 3’

3. 3’ AAGATCC 5’

4. 5’ GGTATTC 3’

Q.

DNA consists of two complementary nucleotide chains. If the sequence of nucleotides in one of the chains is AGCTTCGA then the complementary sequence of the other chain will be

1. TCGAAGCT

2. TCGTATCG

3. AATTCCGG

4. TCGAACTG