1.The difference between spermiogenesis and spermiation is
(a) In spermiogenesis spermatids are formed, while in spermiation spermatozoa are formed.
(b) In spermiogenesis spermatozoa from sertoli cells are released into the cavity of seminferous tubules, while in spermiation spermatozoa are formed.
(c) In spermiogenesis spermatozoa are formed while in spermiation spermatids are formed.
(d) In spermiogenesis spermatozoa are formed, while in spermiation spermatozos are released from sertoli cells into the cavity of seminiferous tubules.
Ans: (d) In spermiogenesis spermatozoa are formed, while in spermiation spermatozos are released from sertoli cells into the cavity of seminiferous tubules.
2.Which of the following options correctly represents the lung conditions in asthma and emphy- sema, respectively?
(a) Inflammation of bronchioles, Decreased respiratory surface
(b) Increased respiratory surface, Inflammation of bronchioles
(c) Increased number of bronchioles, Increased respiratory surface
(d) Decreased respiratory surface; Inflammation of bronchioles
Ans: (a) Inflammation of bronchioles, Decreased respiratory surface
3.Which of the following events does not occur in rough endoplasmic reticulum? (a) Protein folding
(b) Cleavage of signal peptide
(c) Protein glycosylation
(d) Phospholipid synthesis
Ans: (c) Protein glycosylation
4.Which of these statements is incorrect?
(a) Enzymes of TCA cycle are present in
mitochondrial matrix.
(b) Glycolysis operates as long as it is supplied with NAD that can pick up hydrogen atoms.
(c) Glycolysis occurs in cytosol
(d) Oxidative phosphorylation takes place in outer mitochondrial membrane.
Ans: (d) Oxidative phosphorylation takes place in outer mitochondrial membrane.
5.Nissl bodies are mainly composed of
(a) Proteins and lipids
(b) Nucleic acids and SER
(c) DNA and RNA
(d) Free ribosomes and RER
Ans: (d) Free ribosomes and RER
6.Which of the following terms describe human dentition?
(a) Thecodont, Diphyodont, Homodont
(b) Pleurodont, Monophyodont, Homodont
(c) Thecodont, Diphyodont, Heterodont
(d) Pleurodont, Diphyodont, Heterodont
Ans: (c) Thecodont, Diphyodont, Heterodont
7.Select the incorrect match:
(a) Lampbrush chromosomes:Diplotene bivalents
(b) Submetacentric chromosomes:L-shaped chromosomes
(c) Allosomes:Sex chromosomes
(d) Polytene Chromosomes:Oocytes of amphibians
Ans: (d) Polytene Chromosomes:Oocytes of amphibians
8.Many ribosomes may associate with a single mRNA to form multiple copies of a polypeptide simultaneously. Such strings of ribosomes are termed as
(a) Polysome
(b) Plastidore
(c) Polyhedral bodies
(d) Nucleosome
Ans: (a) Polysome
9.According to Hugo de Vries, the mechanism of
evolution is
(a) Multiple step mutations
(b) Phenotypic variations
(c) Saltation
(d) Minor mutations
Ans: (c) Saltation
10.All of the following are part of an operon except
(a) An operator
(b ) An enhancer
(c) Structural genes
(d) A promoter
Ans: (b ) An enhancer
11.AGGTATCGCAT is a sequence form the coding strand of a gene. What will be the corre sponding sequence of the transcribed mRNA?
(a) AGGUAUCGCAU
(b) ACCUALGCGAU
(c) UGGTUTCGCAT
(d) UCCALAGCGUA
Ans: (a) AGGUAUCGCAU
12.A woman has an X-linked condition on one of her X chromosomes. This chromosome can be inherited by
(a) Only daughters
(b) Only grandchildren
(c) Only sons
(d) Both sons and daughters
Ans: (d) Both sons and daughters
13.Which of the following gastric cells indirectly help in erythropoiesis?
(a) Chief cells
(b) Goblet cells
(c) Mucous cells
(d) Parietal cells
Ans: (d) Parietal cells
14.Which of the following is an occupational respiratory disorder?
(a) Anthracis
(b) Botulism
(c) Silicosis
(d) Emphysema
Ans: (c) Silicosis
15.Calcium is important in skeletal muscle contraction because it
(a) Binds to troponin to remove the masking of active sites on actin for myosin
(b) Detaches the myosin head from the actin filament
(c) Activates the myosin ATPase by binding to it.
(d) Prevents the formation of bonds between the myosin cross bridges and the actin filament.
Ans: (a) Binds to troponin to remove the masking of active sites on actin for myosin
