Structure of RNA

Q. What are jumping genes?

Q. The genetic material in tobacco mosaic virus is

1. ss DNA
2. ss RNA
3. ds RNA
4. ds DNA

Q.

RNA and DNA are chiral molecules, their chirality is due to:

1. D-sugar Component

2. Chiral bases

3. Chiral phosphate ester units

4. L-sugar component

Q.

What are catalytic RNAs?

Q.

Why are RNA viruses exceptions to the central dogma?

Q. The first genetic material could be

1. protein
2. carbohydrates
3. DNA
4. RNA

Q.

Which of the following is true for nucleolus?

1. It is a site for active ribosomal RNA synthesis

2. It is a membrane-bound structure

3. Larger nucleoli are present in dividing cells

4. It takes part in spindle formation

Q.

Name the pyrimidine bases present in DNA.

Q. Consider the following statements and select the correct option:
(a) Transcription and translation can be coupled in bacteria
(b) The split gene arrangements represent the advanced feature of the genome
(c) The process of splicing represents the dominance of RNA-world
(d) The presence of introns in split gene is reminiscent of antiquity

1. a, b, d
2. a, b, c
3. a, c, d
4. All of the above

Q.

Which is the most abundant protein in the world?

Q. Tobacco mosaic virus (TMV) genes are

1. single stranded RNA
2. double stranded DNA
3. proteinaceous
4. double stranded RNA.

Q. The coding sequences found in split genes are called

1. exons
2. Operons
3. introns
4. cistrons

Q.

How were nucleosides formed?

Q. Given below is the diagram of a virus. Identify the option with correct labelling of A, B and C.

1. A-RNA, B-Capsomere, C-Bacteriophage
2. A-DNA, B-Capsid, C-Bacteriophage
3. A-RNA, B-Capsid, C-Tobacco mosaic virus
4. A-RNA, B-Capsid, C-Bacteriophage

Q.

Is the nucleolus membrane-bound?

Q. If the diploid number of chromosomes in female grasshopper is 2n, then the number of chromosomes in sperms in this insect would be
[0.7 mark]

1. 50% (n), 50% (n – 1)
2. 50% (n), 50% (n + 1)
3. 100% (n)
4. 100% (n – 1)

Q.

Peptidyl transferase enzyme of eukaryotes is synthesized by___.

Q.

Does RNA contain nitrogen?

Q. The four bases present in RNA are

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

Q. Which one of the following organelles digests the old organelles that are no longer useful to the cells?

1. Ribosomes
2. Mitochondria
3. Lysosomes
4. Chromatin

Q.

What are the main substituted purines?

Q.

What is gene coding?

Q.

RNA is the genetic material in

1. T4 virus

2. T2 virus

3. TMV

4. SV40

Q. DNA and RNA have four bases. Three of them are common. Which base is not common in DNA and RNA?

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

Q. Which of the following important biochemical reactions in living systems is catalysed by a ribozyme?

Q. Chargaff’s rules are applicable to

1. Single stranded RNA
2. Single stranded DNA
3. Double stranded RNA
4. Double stranded DNA

Q.

Which of the following are the functions of RNA?

1. All of the above

2. It is a constituent component of ribosomes.

3. It carries amino acids to ribosomes.

4. It is a carrier of genetic information from DNA to ribosomes synthesising polypeptides.

Q.

How may different bases are found in DNA molecule? Which bases pair together?

Q.

Subunits of a mitochondrial ribosome in animal cells are

1. 25S and 40S

2. 28S and 39S

3. 30S and 40S

4. 40S and 20S

Q.

The inducer for switching 'on' the lac operon in bacteria is

1. Presence of sucrose

2. Presence of structural genes in the bacteria

3. Number of bacteria

4. Presence of lactose