Which of the following statements is correct?
I. The biochemical nature of genetic material was not defined from the experiments conducted by Griffith
II. Working on transformation Avery et al concluded DNA is genetic material but not all biologists were convinced
III. RNA is the genetic material in TMV, QB bacteriophage etc.
IV. DNA is the predominant genetic material while RNA performs dynamic functions of messenger adapter
V. Viruses having DNA genome and having shorter life span mutate and evolve faster
(a) All are correct (b) I and II (c) All except V (d) III and IV
The prediction of sequence of amino acid is _____A ____ if the sequence of nucleotides mRNA is known. The prediction of sequence of nucleotide is concerned mRNA is ____B____ because the genetic code is _____C_____:
(a) A - possible, B - impossible, C - universal
(b) A - possible, B - impossible, C - degenerate
(c) A - impossible, B - possible, C - universal
(d) A - impossible, B - possible, C - degenerate
Choose the correct statements:
I. Binding of mRNA to the ribosome is loose and reversible.
II. The ribosome, which is composed of tRNA and proteins, consists of a small and large subunit.
III. Each of the 20 amino acids has a minimum of one specific tRNA molecule.
IV. tRNAMET binds to the first codon (AUG) - this is called the START codon.
V. The second tRNA binds to the second codon so that their attached monosaccharides are next to each other
VI. The newly formed polypeptide may undergo post-transcriptional modification.
(a) I, III and IV (b) II, IV, VI (c) II, V and VI (d) I, V, VI
The length of DNA has 45000 base pairs. How many complete turns will the DNA molecule take?
(a) 45000 (b) 450 (c) 4500 (d) 45
Go through the following facts:
I. 'AAG' always code for lysine. It cannot code for any other amino acid.
II. Serine amino acid can be coded by UCU / UCC / UCA or UCG.
III. UUU from phenylalanine in bacteria as well as human beings.
IV. UUU GGG CCC AAA Me codes for five amino acids.
Now point out nature of genetic code after reading above:
(a) 1 – Specificity / Non-ambiguity of code; II - Universality of code; III - Degeneracy of code; IV - Triplet and non-overlapping code
(b) I – Specificity / Non-ambiguity of code; II - Degeneracy of code; III - Universality of code; IV - Triplet and non-overlapping code
(c) 1 – Specificity / Non-ambiguity of code; II - Degeneracy of code; III - Universality of code; IV - Triplet and overlapping code
(d) 1 – Specificity / Non-ambiguity of code; II - Universality of code; III - Degeneracy of code; IV - Triplet and overlapping code
The full form of ELSI is:
(a) Embedded Low Software Index (b) Ear Lung Spleen Immunity
(c) Ethical Legal and Social Issue (d) Endonuclease Ligase Surface Immunity
DNA fingerprinting works because:
(a) Genes containing the same alleles make it simple to compare different individuals
(b) PCR allows amplification of proteins from single cells
(c) There are multiple alleles for some DNA sequences, making it possible to obtain unique patterns for each individual
(d) DNA in the skin cells is very diverse
DNA replication in eukaryotes differs from replication in bacteria because:
(a) Synthesis of the new DNA strand is from 3' to 5' in eukaryotes and from 5' to 3' in bacteria
(b) Synthesis of the new DNA strand is from 5' to 3' in eukaryotes and from 3' to 5' in bacteria
(c) There are many replication forks in each eukaryotic chromosome and only one in bacterial DNA
(d) Synthesis of the new DNA strand is from 5' to 3' in eukaryotes and is random in prokaryotes
(a) Heritable changes in the sequence of DNA bases that produce an observable phenotype
(b) Heritable changes in the sequence of DNA bases
(c) Mistakes in the incorporation of amino acids into proteins
(d) Heritable changes in the mRNA of an organism
You have analyzed the DNA isolated from a newly discovered virus and found that its base composition is 32% A, 17% C, 32% G, and 19% T. What would be a reasonable explanation of this observation?
(a) The virus must be extraterrestrial
(b) In some viruses, double-stranded DNA is made up of base pairs containing two purines or two pyrimidines
(c) Some of the T was converted to C during the isolation procedure
(d) The genome of the phage is single-stranded not double-stranded