Nitrogenous Base

Q. Stickiness of the ends of the DNA facilitates the

1. Action of DNA ligase and these ends joined together laterally
2. Action of Taq polymerase
3. Action of restriction enzyme
4. Action of DNA ligase and these ends joined together end-to-end

Q. RNA is less stable genetic material as compared to DNA. The reason for this is

1. All of the above
2. In RNA, $2$’ position has $-OH$ group while DNA does not
3. RNA has uracil while DNA has thymine
4. RNA is also known to be catalytic

Q. Purines bond with __________ by forming hydrogen bonds.

1. both purines and pyrimidines
2. only purines
3. either purines or pyrimidines
4. only pyrimidines

Q.

Glycosidic linkage present in starch or glycogen generally is

1. Beta 1-->4

2. Alpha 1-->4

3. Alpha 2-->1

4. Beta 2-->1

Q.

Tonoplast is the membrane surrounding the:

1. (a) Cytoplasm

2. (b) Vacuole

3. (c) Nucleus

4. (d) Mitochondria

Q. What is the number of bivalents in a typical human meiocyte
(1)23
(2)46
(3)92
(4)22

Q. All the terminator codons begin with the nucleotide

1. adenine
2. guanine
3. uracil
4. thymine

Q. Which of the following is/are pyrimidine(s)?

1. Adenine
2. Cytosine
3. Thymine
4. Uracil

Q. A nucleic acid molecule contains methylated uracil, it is labeled as

1. Either DNA or RNA
2. RNA
3. DNA
4. RNA of prokaryotes

Q. Thymine is a ________.

1. Amino acid
2. Purine
3. Pyrimdine
4. Fatty acid

Q.

Name the cytoplasmic matrix of the cell body.

Q. DNA and RNA differ by

Q. Purines bond with __________ by forming hydrogen bonds.

1. only purines
2. both purines and pyrimidines
3. either purines or pyrimidines
4. only pyrimidines

Q. Phosphorus is a structural element in

1. Carbohydrate
2. Starch
3. Nucleotides
4. Fats

Q. Why is DNA and not RNA, the genetic material in majority of organisms?

Q. Restriction endonucleases are

1. Synthesised by bacteria for their defence
2. Used in genetic engineering for uniting two DNA molecules
3. Present in mammalian cells for degeneration of DNA of dead cells
4. Used for in vitro DNA synthesis

Q. Which of the following is found in RNA but not DNA?

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

Q.

Which of the following are pyrimidine bases?

1. A and G

2. A and C

3. C, T and U

4. A and U

Q. Which substance is used to visualize DNA bands in gel electrophoresis? [1]
a) Ethidium bromide
b) Ethyl acetate
c) Calcium chloride
d) Calcium acetate

Q. Given below are groups of terms. In each group the first pair indicates the relationship between the two terms. Rewrite and complete the second pair on a similar basis.
Example : Oxygen : Inspiration : : Carbon dioxide : Expiration
Adenine : Thymine : : Cytosine : __________.

Q. Which of the following is pyrimidine base ?

1. Adenine
2. Guanine
3. Uracil
4. All the above

Q.

Kitchen of the cell is:

1. Mitochondria

2. endoplasmic reticulum

3. chloroplast

4. golgi apparatus

Q. The purine bases of DNA are

1. U and G
2. A and G
3. A and C
4. None of the above

Q. A nucleoside is formed of

1. Phosphate and nitrogen base
2. Pentose sugar, phosphate and nitrogen base
3. Pentose sugar and nitrogen base
4. Pentose sugar and phosphate

Q. The nucleic acid base having two possible binding sites is:

1. thymine
2. cytosine
3. guanine
4. adenine

Q. Which of the following is/are pyrimidine(s)?

1. Adenine
2. Cytosine
3. Thymine
4. Uracil

Q. Which of the following is found in RNA but not DNA?

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

Q. Distance between two adjacent nitrogen bases of DNA is

1. 2.4 A
2. 3.4 A
3. 24 A
4. 34 A

Q. Each codon consists of how many nitrogen bases?

1. twenty
2. three
3. four
4. sixty four

Q. Identify the components labelled a, b, c, d, e and f in the given figure from the list (i) to (vi) given below.
Components:
(i) Glycoprotein
(ii) Cholesterol
(iii) Extrinsic protein
(iv) Glycolipid
(v) Intrinsic protein
(vi) Carbohydrate
The correct components are

1. a-(i), b-(iv), c-(vi), d-(ii), e-(v), f-(iii)
2. a-(iv), b-(i), c-(ii), d-(vi), e-(v), f-(iii)
3. a-(iv), b-(i), c-(vi), d-(ii), e-(iii), f-(v)
4. a-(iv), b-(i), c-(vi), d-(ii), e-(v), f-(iii)