Zoology
In mitosis, centrioles at opposite poles duplicate during:
A.
Prophase
B.
Metaphase
C.
Anaphase
D.
Telophase
Mark the correct sequence of mitotic division:
A.
Metaphase => Anaphase => Telophase => Prophase
B.
Metaphase => Telophase => Anaphase => Prophase
C.
Prophase => Metaphase => Anaphase => Telophase
D.
Prophase => Anaphase => Metaphase => Telophase
In mitosis the centromere divides at:
A.
Prometaphase
B.
Metaphase
C.
Anaphase
D.
Telophase
Which of the following is the longest stage of meiotic division?
A.
Prophase - I
B.
Metaphase - I
C.
Anaphase - I
D.
Telophase - I
The second meiotic divisions is known as:
A.
Heterotypic
B.
Homeotypic
C.
Amitosis
D.
None of these
During the first meiotic division:
A.
The sister chromatids separate
B.
The non-homologous chromosomes separate
C.
The homologous chromosomes separate
D.
None of these
Meiosis is a type of cell division in which the :
A.
Number of chromosomes are reduced to half
B.
Number of chromosomes remain the same
C.
Chromosomes undergo longitudinal splitting
D.
Number of chromosomes are doubled
In the process of meiosis the chromosomes divide ______ and the nucleus and cytoplasm _______ divide:
A.
Once, Twice
B.
Twice, Once
C.
Once, Once
D.
Twice, Twice
Polytene chromosomes are permanent __________ Chromosomes:
A.
Prophase
B.
Metaphase
C.
Telophase
D.
Interphase
The gene concept was introduced by:
A.
Johannsen
B.
Sutton
C.
Lederberg
D.
Tatum
Lampbrush chromosomes are found in the ______ of many vertebrates:
A.
Yolk rich oocytes
B.
Salivary gland cells
C.
Fat body cells
D.
Muscle cells
The balbiani rings of polytene chromosomes are rich in:
A.
DNA
B.
RNA
C.
DNA and RNA
D.
Proteins and mRNA
Which of the following is the most appropriate description of the unit membrane?
A.
Glycoprotein
B.
Protein bilayer
C.
Phosphoprotein
D.
Lipoprotein layer
Which of the following chromosomes are found in salivary gland of Drosophila!
A.
Normal
B.
Heterochromatic
C.
Lamp brush
D.
Polytene
The nucleus of a cell originates from:
A.
Lysosomes
B.
Golgi body
C.
Chromosome
D.
Peroxisome
The function of the "nonsense codons" is:
A.
To release polypeptide chains from the t-RNA molecule
B.
To form unspecified amino acids
C.
To determine the messages for the gene controlled protein synthesis
D.
To assist the protein synthesis
Restriction enzymes help:
A.
To cut DNA at certain places
B.
To synthesize DNA
C.
To synthesize RNA
D.
To synthesize ATP
The process of synthesis of proteins postulates that genetic information flows from nucleic acid to protein. It can be illustrated as follows:
A.
Replication => Transcription => Translation
B.
Transcription => Replication => Translation
C.
Translation => Replication => Transcription
D.
Replication => Translation => Transcription
The optically hyaline portion of the protoplasm is known as:
A.
Mesoplasm
B.
Endoplasm
C.
Cytoplasm
D.
Hyaloplasm
Glycolate oxidases occur in:
A.
Peroxisomes
B.
Glyoxysomes
C.
Lysosome
D.
Microsome
One of the following is a technique for the quantitative estimation of the substance in a cell?
A.
Autoradiography
B.
Chromatography
C.
Micro spectrophotometry
D.
X-ray crystallography
Which among the following is required for the transcription of RNA from DNA?
A.
DNA polymerase
B.
DNA ligase
C.
Restriction endonuclease
D.
RNA polymerase
DNA is present in:
A.
Nucleus only
B.
Nucleus and mitochondria
C.
Nucleus, mitochondria and chloroplast
D.
Nucleus and lysosome
If in a DNA template, the sequence of bases is AGGATAACC, which one of the following would be the correct sequence of base of a messenger RNA transcribed from it?
A.
TCCUAGGTT
B.
UCCUAUUGG
C.
TCCUUGGTT
D.
AGGAUAACC
The dominant gene which is present in the X chromosome and responsible for defective tooth enamel is the example of:
A.
Sex-limited gene
B.
Sex-linked gene
C.
Sex-influenced gene
D.
None of these