- How many of the following statements are true in context
of human genome?
I. There are 1.4 million SNPs.
II. 99.9% genome is similar in all humans.
III. 32% genome codes for proteins.
IV. Largest human gene is dystrophin with 2.4 billion base
pairs.
V. Human genome has maximum number of genes on 1st
chromosome i.e., 3968.
(a) 2 (b) 1 (c) 3 (d) 4 - Find out the correct matching of column I and column II
from the codes given below.
Column I Column II
A. Helicase (i) Joining of deoxyribo-
nucleotides
B. 23S rRNA (ii) Working within Y-fork
C. DNA directed RNA (iii) Peptide bond formation
polymerase
D. DNA polymerase III (iv) RNA primer
(a) A-(ii), B-(iii), C-(iv), D-(i)
(b) A-(i), B-(ii), C-(iii), D-(iv)
(c) A-(iv), B-(iii), C-(i), D-(ii)
(d) A-(ii), B-(iv), C-(iii),D-(i) - Polypeptide chain in eukaryotes is initiated by
(a) glycine (b) leucine
(c) methionine (d) lysine. - Euchromatin is
A. loosely packed B. stains light
C. transcriptionally active D. early replicating.
(a) A and C (b) A, B, C and D
(c) B, C and D (d) A, B and C
MOLECULAR BASIS OF INHERITANCEPRACTICE PAPER
CLASS
XII
This paper contains 45 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE
is correct. (Mark only one choice).Marks : 45 × 4 = 180 Negative Marking (–1)Contributed by : Harpal Singh, Harpal's Biology Classes, Chandigarh, 09781124215- Which one is correct?
(a) DNA replication occurs before mitosis, meiosis and
amitosis.
(b) The polarity of DNA template on which leading strand
formed is 3′→ 5 ′.
(c) The products of gene may be rRNA, tRNA and mRNA.
(d) All of these - Stability of DNA is due to
(a) hydrogen bonds
(b) stacking interactions between flat aromatic surfaces of
adjacent base pairs
(c) van der Waals forces and hydrophobic interactions
(d) all of these. - Which one of the following is wrongly matched?
(a) Transcription – Writing information from DNA
to mRNA.
(b) Translation – Using information in mRNA to
make protein.
(c) Repressor protein – Binds to operator to stop
enzyme synthesis.
(d) Operon – Structural genes, operator,
promoter and intron. - In a RNA strand, two adjacent nucleotides are linked
together by
(a) – S – S – linkage
(b) van der Waals forces
(c) 3 ′ - 5′ phosphodiester bonds
(d) hydrogen bonds. - If a double stranded DNA molecule contains 30% T, how
much G does it contain?
(a) 20% (b) 30% (c) 40% (d) 50%