The final proof for DNA as the genetic material came from the experiments of
a.
Hargobind Khorana
b.
Griffith
c.
Hershey and Chase
Correct Answer
d.
Avery, Mcleod and McCarty
Step-by-Step AI Explanation
Verified Method
Hershey and Chase gave unequivocal proof which ended the debate between protein and DNA as genetic material.
Q2mcq
Spliceosomes are not found in cells of
a.
Bacteria
Correct Answer
b.
Plants
c.
Fungi
d.
Animals
Step-by-Step AI Explanation
Verified Method
Spliceosomes are used in removal of introns during post-transcriptional processing of hnRNA in eukaryotes only, as split genes are absent in prokaryotes.
Q3mcq
The pivot joint between atlas and axis is a type of
a.
Saddle joint
b.
Fibrous joint
c.
Cartilaginous joint
d.
Synovial joint
Correct Answer
Step-by-Step AI Explanation
Verified Method
Synovial joints are freely movable joints which allow considerable movements. Pivot joint is a type of synovial joint which provides rotational movement, as seen between the atlas and axis vertebrae of the vertebral column.
Q4mcq
The association of histone H1 with a nucleosome indicates:
a.
The DNA double helix is exposed
b.
Transcription is occurring
c.
DNA replication is occurring
d.
The DNA is condensed into a Chromatin Fibre
Correct Answer
Step-by-Step AI Explanation
Verified Method
The association of H1 protein indicates the complete formation of the nucleosome; therefore, the DNA is in a condensed form.
Q5mcq
Which of the following is made up of dead cells?
a.
Phloem
b.
Xylem parenchyma
c.
Collenchyma
d.
Phellem
Correct Answer
Step-by-Step AI Explanation
Verified Method
Cork cambium undergoes periclinal division and cuts off thick-walled suberised dead cork cells (phellem) towards the outside, and thin-walled living cells (phelloderm) on the inner side.
Q5mcq
Which of the following is made up of dead cells?
a.
Phloem
b.
Xylem parenchyma
c.
Collenchyma
d.
Phellem
Correct Answer
Step-by-Step AI Explanation
Verified Method
Cork cambium undergoes periclinal division and cuts off thick-walled suberised dead cork cells (phellem) towards the outside.
Q6mcq
Select the correct route for the passage of sperms in male frogs:
In male frogs, the sperms move from Testes to Vasa efferentia, then into the Kidney via Bidder's canal, and finally through the Urinogenital duct to the Cloaca.
Q6mcq
Select the correct route for the passage of sperms in male frogs :
In male frogs, the sperms move from Testes -> Vasa efferentia -> Kidney -> Bidder's canal -> Urinogenital duct -> Cloaca.
Q7mcq
Adult human RBCs are enucleate. Which of the following statement(s) is/are most appropriate explanation for this feature?
(a) They do not need to reproduce
(b) They are somatic cells
(c) They do not metabolize
(d) All their internal space is available for oxygen transport
a.
(b) and (c)
b.
Only (d)
Correct Answer
c.
Only (a)
d.
(a), (c) and (d)
Step-by-Step AI Explanation
Verified Method
The primary evolutionary advantage of RBCs losing their nucleus and most organelles during maturation is to maximize the space available for haemoglobin, the oxygen-carrying pigment.
Q8mcq
Homozygous purelines in cattle can be obtained by
a.
Mating of individuals of different species
b.
Mating of related individuals of same breed
Correct Answer
c.
Mating of unrelated individuals of same breed
d.
Mating of individuals of different breed
Step-by-Step AI Explanation
Verified Method
Inbreeding (mating of related individuals) increases homozygosity, which is required for the development of purelines.
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Match the following sexually transmitted diseases (Column - I) with their causative agent (Column - II) and select the correct option.
Column - I Column - II
(a) Gonorrhea (i) HIV
(b) Syphilis (ii) Neisseria
(c) Genital Warts (iii) Treponema
(d) AIDS (iv) Human Papilloma virus
a.
(a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
b.
(a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
c.
(a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)
d.
(a)-(iv), (b)-(ii), (c)-(iii), (d)-(i)
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Match the diseases in Column - I with their causative agent (Column - II) and select the correct option.
Column - I | Column - II
(a) Gonorrhea | (i) HIV
(b) Syphilis | (ii) Neisseria
(c) Genital Warts | (iii) Treponema
(d) AIDS | (iv) Human Papilloma virus
a.
(1) (iv) (iii) (ii) (i)
b.
(2) (ii) (iii) (iv) (i)
c.
(3) (iii) (iv) (i) (ii)
d.
(4) (iv) (ii) (iii) (i)
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Which among the following are the smallest living cells, known without a definite cell wall, pathogenic to plants as well as animals and can survive without oxygen?
a.
Nostoc
b.
Bacillus
c.
Pseudomonas
d.
Mycoplasma
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If there are 999 bases in an RNA that codes for a protein with 333 amino acids, and the base at position 901 is deleted such that the length of the RNA becomes 998 bases, how many codons will be altered?
a.
333
b.
1
c.
11
d.
33
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Anaphase promoting complex (APC) is a protein degradation machinery necessary for proper mitosis of animal cells. If APC is defective in a human cell, which of the following is expected to occur?
a.
Recombination of chromosome arms will occur
b.
Chromosomes will not condense
c.
Chromosomes will be fragmented
d.
Chromosomes will not segregate
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Frog's heart when taken out of the body continues to beat for some time. Select the best option from the following statements: (a) Frog is a poikilotherm (b) Frog does not have any coronary circulation (c) Heart is "myogenic" in nature (d) Heart is autoexcitable
a.
(c) & (d)
b.
Only (c)
c.
Only (d)
d.
(a) & (b)
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Frog's heart when taken out of the body continues to beat for some time. Select the best option from the following statements: (a) Frog is a poikilotherm (b) Frog does not have any coronary circulation (c) Heart is "myogenic" in nature (d) Heart is autoexcitable
a.
(c) & (d)
b.
Only (c)
c.
Only (d)
d.
(a) & (b)
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Transplantation of tissues/organs fails often due to non-acceptance by the patient's body. Which type of immune-response is responsible for such rejections?
a.
Physiological immune response
b.
Autoimmune response
c.
Cell-mediated immune response
d.
Hormonal immune response
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Good vision depends on adequate intake of carotene rich food. Select the best option from the following statements: (a) Vitamin A derivatives are formed from carotene (b) The photopigments are embedded in the membrane discs of the inner segment (c) Retinal is a derivative of vitamin A (d) Retinal is a light absorbing part of all the visual photopigments
a.
(b), (c) & (d)
b.
(a) & (b)
c.
(a), (c) & (d)
d.
(a) & (c)
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A baby boy aged two years is admitted to play school and passes through a dental check-up. The dentist observed that the boy had twenty teeth. Which teeth were absent?
a.
Molars
b.
Incisors
c.
Canines
d.
Pre-molars
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The genotypes of a Husband and Wife are IAIB and IAi. Among the blood types of their children, how many different genotypes and phenotypes are possible?
a.
4 genotypes ; 4 phenotypes
b.
3 genotypes ; 3 phenotypes
c.
3 genotypes ; 4 phenotypes
d.
4 genotypes ; 3 phenotypes
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Out of 'X' pairs of ribs in humans only 'Y' pairs are true ribs. Select the option that correctly represents values of X and Y and provides their explanation :
a.
X = 24, Y = 12 True ribs are dorsally attached to vertebral column but are free on ventral side
b.
X = 12, Y = 7 True ribs are attached dorsally to vertebral column and ventrally to the sternum
c.
X = 12, Y = 5 True ribs are attached dorsally to vertebral column and sternum on the two ends
d.
X = 24, Y = 7 True ribs are dorsally attached to vertebral column but are free on ventral side
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