CBSE
Multiple Choice QuestionsWhich of the following is correct regarding genetic code?
UUU is the initiation codon which also codes for phenylalanine.
There are 64 triplet codons and only 20 amino acids
Three random nitrogen bases specify the placement of one amino acid
UAA is the nonsense codon which also codes for methionine
During protein synthesis in an organism at one point the process comes to a halt. Select the group of the three codons from the following, from which any one of the three could bring about this halt.
UUU, UCC, UAU
UUC, UUA, UAC
UAG, UGA, UAA
UUG, UCA, UCG
Assertion: One codon may code for more than one amino acid.
Reason: A codon is degenerate and ambiguous.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Beads on string like structures of A are seen in B, which further condense to form chromosomes in C stage of cell division
A B C
Chromonema Chromatin Metaphase
A B C
Chromatin Chromatid Metaphase
A B C
Chromonema Chromosome Anaphase
A B C
Chromonema Chromatid Anaphase.
Assertion : DNA fingerprinting involves identifying differences in specific regions in DNA sequence.
Reason : DNA fingerprinting is the basis of paternity testing.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Chromatin is made up of
DNA and protein
DNA and histone
DNA, RNA, protein
RNA, histone and oil bodies
What is incorrect about the following figure representing DNA replication?
The direction of DNA replication in strand (i)
The direction of DNA replication in strand (ii)
Discontinuous replication of strand (i)
Discontinuous replication of strand (ii)
RNA interference is essential for the
cell proliferation
cell defence
cell differentiation
micropropagation
Which of the following is a palindromic sequence?
5' - CGTATG - 3'
3' - GCATAC - 5'
5' - CGAATG - 3'
3' - CGAATG - 5'
5' - GAATTC - 3'
3' - CTTAAG - 5'
5' - GACTAC - 3'
3' - TACGAC - 5'
The binding site of tRNA with mRNA & amino acids respectively are
mRNA with DHU loop and amino acid with CCA end.
mRNA with CCA end and amino acid with anticodon loop
mRNA with anticodon loop and amino acid with DHU loop
mRNA with anticodon loop and amino acid with CCA end
