rRNA

Q.

Who discovered the nucleolus?

Q. Select the correct statements regarding transcription in prokaryotes and eukaryotes.

1. Capping and tailing takes place in prokaryotes.
2. Splicing takes place only in eukaryotes.
3. Transcription takes place in the cytoplasm in prokaryotes.
4. Prokaryotes have introns.

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

Q.

What are the characteristics of RNA?

Q. What is aminoacylation? State its significance. [2]

Q.

How is translation regulated in prokaryotes?

Q. Which one of the following group of codons is called as degenerate codons?

1. GUA, GUG, GCA, GCG and GAA
2. UUC, UUG, CCU, CAA and CUG
3. UAA, UAG and UGC
4. UUA, UUG, CUU, CUC and CUG

Q. Assertion: In eukaryotes, replication and transcription occur in the nucleus but translation takes place in the cytoplasm.

Reason: mRNA is transferred from the nucleus into cytoplasm where ribosomes and amino acids are available for protein synthesis.

1. Both assertion and reason are true and reason is the correct explanation of assertion
2. Both assertion and reason are true but reason is not the correct explanation of assertion
3. Assertion is true but reason is false
4. Both assertion and reason are false

Q.

Characters transmitted from parents to offspring are present in

1. Cytoplasm

2. Ribosome

3. Golgi bodies

4. Genes

Q. A cell organelle containing hydrolytic enzymes is

1. Ribosomes
2. Mesosomes
3. Microsome
4. Lysosome

Q. RNAi involves

1. Synthesis of mRNA from DNA.
2. Interference of RNA in synthesis of DNA.
3. Synthesis of cDNA from RNA using reverse transcriptase.
4. Silencing of specific mRNA using complementary RNA.

Q. What is specialised transduction? explain

Q.

What is the function of the exon?

Q. Which antibiotic inhibits interaction between tRNA and mRNA during bacterial protein synthesis?

1. Tetracycline
2. Erythromycin
3. Neomycin
4. Streptomycin

Q. In the RNAi technology, specific mRNA is silenced by complementary [1]
a) mRNA
b) dsRNA
c) ssDNA
d) dsDNA

Q. Which of the following rRNAs acts as structural RNA as well as ribozyme in bacteria

1. 5·8s rRNA
2. 5s rRNA
3. 23s rRNA
4. 18s rRNA

Q.

Find out the correct sentence

1. Enzymes packed in Lysosomes are made through RER (rough endoplasmic reticulum)

2. Rough endoplasmic reticulum and smooth endoplasmic reticulum produce lipid and protein respectively

3. The endoplasmic reticulum is related to the destruction of the plasma membrane

4. Nucleoid is present inside the nucleoplasm of the eukaryotic nucleus

Q.

Name an organelle involved in protein synthesis?

Q.

Which enzyme is not proteinaceous in nature?

Q. The ‘S’ in 30S and 50S subunits of ribosome stands for __.

Q.

Lysosomes are responsible for:

1. (a) Protein synthesis

2. (b) Digestion of organic molecules

3. (c) Fat synthesis

4. (d) Fat emulsification

Q.

What happens if introns are not removed?

Q. RNA interference is useful for

1. micropropagation
2. cell defence
3. cell proliferation
4. cell differentiation

Q. Which of the following RNAs should be most abundant in animal cell?

1. m-RNA
2. mi-RNA
3. t-RNA
4. r-RNA

Q.

Compare to osmosis, active transport is a rapid process.

1. True
2. False

Q.

Which of the following is called as ‘Suicidal bags?

1. (a) Centrosome

2. (b) Lysosome

3. (c) Microsome

4. (d) Mesosomes

Q. 40S and 60S are

1. Types of rRNA in eukaryotes
2. Types of rRNA in prokaryotes
3. Ribosomal subunits in eukaryotes
4. Ribosomal subunits in prokaryotes

Q. The ‘r’ in ‘rRNA’ stands for

1. Ribosomal

2. Resistant
3. Ribose
4. Replicating

Q.

cDNA is synthesized by

1. Circular DNA

2. Recombinant DNA

3. RNA template

4. None of these

Q. Mention the chemical change that proinsulin undergoes, to be able to act as mature insulin. [1]

Q. Unit of distance between genes in a chromosome is known as

1. C―DNA
2. Morgan
3. Centimorgan
4. Spacer