mRNA

Q. Expressed Sequence Tags (ESTs) refers to :

1. Novel DNA sequences
2. Genes expressed as RNA
3. Polypeptide expression
4. DNA polymorphism

Q. RNA is found in

1. cytoplasm only
2. nucleus only
3. chromosomes only
4. Both A and B

Q. Nucleosome is

1. Intron interrupted DNA.
2. Double helix DNA.
3. Negatively charged DNA wrapped around positively charged histone octamer.
4. Satellite DNA.

Q. Mark the correct statement.

1. mRNA is polycistronic in eukaryotes and monocistronic in prokaryotes
2. mRNA is polycistronic in prokaryotes and monocistronic in eukaryotes
3. mRNA is polycistronic in both eukaryotes and prokaryotes
4. mRNA is monocistronic in both eukaryotes and prokaryotes

Q.

What is the difference between rRNA and ribosomes?

Q. Read the following statements regarding mRNA and tRNA and choose the correct option.

A. mRNA has a more elaborated 3-dimensional structure due to extensive base-pairing.

B. tRNA has a more elaborated 3-dimensional structure due to extensive base-pairing.

C. tRNA is usually smaller than mRNA.

D. mRNA bears anticodons but tRNA has codons.

1. A and C are correct
2. A, B, C and D are correct
3. B and C are correct
4. A, B and C are correct

Q. What are the types of RNA involved in the process of protein synthesis?

1. mRNA
2. rRNA
3. tRNA
4. qRNA

Q. Compare the statements A and B
Statement A: A monocistronic mRNA can produce several types of polypeptide chains.
Statement B : The terminator codon is present on the mRNA.
Select the correct description.

1. Both the statements A and B are wrong
2. Statement A is correct and B is wrong
3. Statement A is wrong and B is correct
4. Both the statements A and B are correct

Q.

Why do eukaryotes require transcription factors?

Q. Match List I with List II and select the correct option.
$\begin{array}{cc}\text{List I}& \text{List II}\\ \text{A. 64 codons}(4\times 4\times 4)& \text{1. Khorana}\\ \text{B. Polycistronic}& \text{2. Eukaryotes}\\ \text{C. Monocistronic}& \text{3. George Gamow}\\ \text{D. Establishing the complete genetic code}& \text{4. Prokaryotes}\end{array}$

1. A - 4, B - 3, C - 2, D - 1
2. A - 3, B - 4, C - 1, D - 2
3. A - 4, B - 3, C - 1, D - 2
4. A - 3, B - 4, C - 2, D - 1

Q. Assertion: Eukaryotic genome is classified into highly repetitive, moderately repetitive, and single-copy DNA on the basis of reiteration.
Reason: Reassociation kinetics of repetitive DNA is slower than the non-repetitive DNA.

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

Q. the essential components of eukaryotic cistrons are

1. Introns
2. Exons
3. operons
4. operator and regulator regions

Q.

What is the difference between polycistronic and monocistronic ?

Q. Which of the following is not true for mRNA?

1. Chargaff’s rule
2. RNA is unstable and degradable
3. Complementary base pairing
4. 5’ phosphoryl end and 3’ hydroxyl end

Q.

State whether true or false.

Prokaryotic genes are polycistronic while eukaryotic genes are monocistronic.

1. True
2. False

Q. Expressed Sequence Tags (ESTs) refers to:

1. Novel DNA sequences
2. Genes expressed as RNA
3. Polypeptide expression
4. DNA polymorphism

Q. Refer the given sequence of steps and select the correct option.

$DNA\stackrel{\left(i\right)}{\to }hnRNA\stackrel{\left(ii\right)}{\to }mRNA\stackrel{\left(iii\right)}{\to }Proteins$

1. $\begin{array}{ccc}\left(i\right)& \left(ii\right)& \left(iii\right)\\ \text{Replication}& \text{Transcription}& \text{Translation}\end{array}$
2. $\begin{array}{ccc}\left(i\right)& \left(ii\right)& \left(iii\right)\\ \text{Replication}& \text{Processing}& \text{Translation}\end{array}$
3. $\begin{array}{ccc}\left(i\right)& \left(ii\right)& \left(iii\right)\\ \text{Transcription}& \text{Splicing}& \text{Translation}\end{array}$
4. $\begin{array}{ccc}\left(i\right)& \left(ii\right)& \left(iii\right)\\ \text{Transcription}& \text{Replication}& \text{Translation}\end{array}$

Q. When many genes are transcribed into a single mRNA strand, the mRNA is said to be __.

1. polycistronic

Q. Polycistronic transcription units are mostly found in genome of

1. algae
2. bacteria
3. mammals
4. protozoa

Q.

Give a note on lysosomes.

Q.

Discuss with your teacher and find out how to distinguish between

(a) Plasmid DNA and chromosomal DNA

(b) RNA and DNA

(c) Exonuclease and Endonuclease

Q.

if bacteria is polycistronic and dna is monocistronic then how does bacteria becomes monocistronic

Q.

State whether true or false.

Prokaryotic genes are polycistronic while eukaryotic genes are monocistronic.

1. True
2. False

Q. Which of the following statement is true with respect to prokaryotic gene?

1. Presence of exon and intron
2. Non split gene
3. Larger than eukaryotic gene
4. More complex than eukaryotic gene

Q. Which of the following statement is true with respect to prokaryotic gene?

1. Presence of exon and intron
2. Non split gene
3. Larger than eukaryotic gene
4. More complex than eukaryotic gene

Q. In expressed sequence tags we said that it is all the genes that are expressed as Rna so can we say that these are the sequence of exons?

Q. Which of the following is considered as physical and chemical unit of heredity?

1. Gene
2. Nucleotide
3. Chromatid
4. Codon
5. Chromosome

Q. Housekeeping genes are constantly expressed because the proteins encoded by them is a

1. Specific protein
2. Structural protein
3. None of the above
4. Helps in the general metabolism of the cell

Q. Where are genetic code, codon and anti-codon located?

Q. what is intron ?what are its example and times ? why it is removed?