Zoology
How many pairs of nucleotides are present in each full turn molecule?
A.
5 pairs
B.
5
C.
10 pairs
D.
10
Which of the sequence does not biosynthesis of ribosomes by the nucleolus follow?
A.
Fibrillar RNA => RNA + ribosome => granular subunits of ribosomes => mature ribosomes
B.
RNA + ribosomal proteins => fibrillar RNA => granular subunits of ribosomes mature ribosomes
C.
Fibrillar RNA granular subunits of ribosomes => RNA + ribosomal proteins mature ribosomes
D.
RNA + ribosomal proteins => granular subunits of ribosomes => fibrillar RNA => mature ribosomes
Which of the following is correct?
A.
Oxidative processes are minimum in premitotic period and maximum during active mitosis
B.
Oxidative processes are maximum in premitotic period and minimum during active mitosis
C.
Oxidative processes do not increase or decrease premitotic period or mitosis
D.
Oxidative processes do not take place in premitotic or mitotic phase
Cytokinesis usually occurs in:
A.
Anaphase
B.
Telophase
C.
Interphase
D.
Metaphase
When a contraction of spindle fibres takes place during anaphase, the daughter chromosomes move apart towards the poles so that:
A.
The centromere is pulled towards the pole and arms of the chromosomes drag behind
B.
The arms are pulled towards the pole and centromere drag behind
C.
The chromosomes move vertically
D.
The chromosomes jump to the poles from the equator
During metaphase, the microtubules in the cytoplasm of the cell orient in between the centrioles of the opposite poles and from the spindle. Such a spindle is known as:
A.
Amphiaster
B.
Uniaster
C.
Blaster
D.
None of these
The chromosomal rearrangement in which a block of genes from one linkage group is transferred to another linkage group is known as:
A.
Deletion
B.
Inversion
C.
Duplication
D.
Translocation
Which one of the following can be used to induce polyploidy?
A.
48
B.
47
C.
46
D.
45
Which of the following is not true about the characters of a triplet codon?
A.
It is non-overlapping
B.
It may specify more than one amino acid
C.
It is comma less
D.
The synthesis of polypeptide chain is initiated by UAG codon
Genetic information exists in DNA molecule in the form of:
A.
Singlet codon
B.
Doublet codon
C.
Triplet codon
D.
Pentalet codon
Polytene chromosomes are formed during:
A.
Fertilization
B.
Larval development
C.
Adult stage
D.
Oogenesis
The sickle cell anaemia is caused by a single mutation in:
A.
One gene
B.
Two genes
C.
Three genes
D.
Numerous genes
Total percentage of DNA that constitutes a chromatin is:
A.
90
B.
80
C.
35
D.
65
The gene which undergo sudden change in expression due to a change in their position are known as:
A.
Holandric genes
B.
Penetrance genes
C.
Mutant genes
D.
Lethal genes
Total number of genes found on 23 pairs of chromosomes in normal human is:
A.
1,00,000
B.
80,000
C.
40,000
D.
60,000
Total number of linkage groups in an individual is equal to the number of:
A.
Total genes on a chromosome
B.
Total chromosome
C.
Chromosome pairs
D.
Inherited genes
Genes which reduces the viability or cause the death of the individual are called:
A.
Penetrance genes
B.
Pleiotropic genes
C.
Holandric genes
D.
Lethal genes
Which one of the following stages does not occurs in mitosis?
A.
Prophase
B.
Metaphase
C.
Anaphase
D.
Diakinesis
Which of the following is true about mitosis?
A.
A diploid cell produces four haploid cells
B.
A diploid cell produces two diploid cells
C.
A haploid cell produces four diploid cells
D.
A diploid cell produces two haploid cells
The shortest place of mitotic division is:
A.
Prophase
B.
Metaphase
C.
Anaphase
D.
Telophase
The sex cells increase their number by:
A.
Meiosis
B.
Homotypic division
C.
Mitosis
D.
Amitosis
The meiosis has:
A.
Long prophase I
B.
Long prophase II
C.
Long interphase
D.
Long metaphase I
The reduction in chromosome number takes place in:
A.
Mitosis
B.
Heterotypic division
C.
Homotypic division
D.
Anaphase II
The nuclear event does not take place in:
A.
Amitosis
B.
Mitosis
C.
Meiosis
D.
None of these
The reductional division among the following is:
A.
Amitosis
B.
Mitosis
C.
Meiosis
D.
None of these