1.
What will be the sequence of mRNA produced by the following stretch of DNA?
3'ATGCATGCATGCATG 5' TEMPLATE STRAND 5' TACGTACGTACGTAC 3' CODING STRAND
A
3' AUGCAUGCAUGCAUG 3'
B
3' AUGCAUGCAUGCAUG 5'
C
5' UACGUACGUACGUAC 3'
D
3' UACGUACGUACGUAC 5'
Answer :
5' UACGUACGUACGUAC 3'
2. One function of the telomeres in a chromosome is to
A
indentify the correct number of the homologous pair of chromosomes
B
help two chromatids to move towards poles
C
"seal" the ends of chromosomes
D
start RNA synthesis
Answer :
"seal" the ends of chromosomes
3. Which one of the following is not applicable to RNA?
A
5' phosphoryl and 3' hydroxyl ends
B
Heterocyclic nitrogenous bases
C
Chargaff's rule
D
Complementary base pairing
Answer :
Chargaff's rule
4. A sequential expression of a set of human genes
A
messenger RNA
B
DNA sequence
C
ribosome
D
transfer RNA
Answer :
DNA sequence
5.
Given below is a sample of a portion of DNA strand. What is so special shown in it?
5' -- GAATTC -- 3'
3' -- CTTAAG -- 5'
A
Replication completed
B
Deletion mutation
C
Start codon at the 5' end
D
Palindromic sequence of base pairs
Answer :
Palindromic sequence of base pairs
6. In which direction m-RNA is synthesised on DNA template ?
A
5' → 3'
B
3' → 5'
C
Both (A) and (B)
D
Any
Answer :
5' → 3'
7. In the process of transcription in Eukaryotes, the RNA polymerase I transcribes -
A
Precursor of mRNA, hnRNA
B
mRNA with additional processing, capping and tailing
C
tRNA, 5 srRNA and snRNAs
D
rRNAs - 28 S, 18 S and 5.8 S
Answer :
rRNAs - 28 S, 18 S and 5.8 S
8. In the genetic code dictionary, how many codons are used to code for all the 20 essential amino acids ?
A
60
B
20
C
64
D
61
Answer :
61
9.
The diagram shows an important concept in the genetic implication of DNA. Fill in the blanks $$A$$ to $$C.$$
A
$$A$$-translation $$B$$- transciption $$C$$-Erwin Chargaff
B
$$A$$-transcription $$B$$- translation $$C$$-Francis Crick
C
$$A$$-translation $$B$$- extension $$C$$-Rosalind Franklin
D
$$A$$-transcription $$B$$- replication $$C$$-James Watson
Answer :
$$A$$-transcription $$B$$- translation $$C$$-Francis Crick
10. During DNA replication, Okazaki fragments are used to elongate:
A
The lagging strand towards replication fork
B
The leading strand away from replication fork
C
The lagging strand away from the replication fork
D
The leading strand towards replication fork
Answer :
The lagging strand away from the replication fork