CSIR NET JRF: Zoology MCQs (Practice-Test 6 of 112)
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Which one of the following pairs of substances and functions is NOT correctly matched?
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- Actin
- Slides past myosin causing contraction
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- Calcium
- Triggers enzymatic action of myosin
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- ATPase
- Enzyme that splits ATP
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- ATP
- Supplies energy for breaking actomyosin
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Which one of the following sets of organisms develops Parthenogenetically?
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Aphids, bees and grasshoppers
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Bees, wasps and ants
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Ants, Aphids and earthworms
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Wasps, cockroaches and fish
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The fertilization cone that pulls the sperms into the egg is formed from the
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acrosome of the sperm
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acrosomal process
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vitelline layers of the egg
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plasma membrane of the egg
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The correct sequence of gastrulation in frog is
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Involution and epiboly
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Invagination, involution and epiboly
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Invagination and convergence
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Convergence, involution and ingression
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In the embryonic development of frog, the animal pole forms
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head
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tail
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dorsal side
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ventral side
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Which one of the following is a vital dye used to observe the embyonic cell movement during gastnulation?
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Janus green
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Toluidine blue
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Eosin
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Alcian blue
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The part of chick embryo comparable to the dorsal tip of amphibian blastopore is the
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primitive streak
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primitive groove
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anterior margin of Hansen's node
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area pellucida
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Match List (Cleavage type) with List II (Exam/feature) and select the correct answer:
List-I List-II -
Meroblastic
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Holoblastic
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Spiral
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Bilateral
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Dextral
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Germinal disc
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Telolecithal
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Mesolecithal
- A
- B
- C
- D
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- 2
- 4
- 3
- 1
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- 4
- 2
- 1
- 3
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- 4
- 2
- 3
- 1
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- 2
- 4
- 1
- 3
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Which one of the following cell organelles participates in the construction of daughter blastomeres during cleavage?
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Microtuu1es
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Microfilaments
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Microsomes
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Micromeres
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Extraembryonic membranes provide protection and secure food for the developing embryo in amniotes. What is the significance of vestigial yolk sac in mammals?
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Adaptive
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Evolutionary
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Protective
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Synthetic
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Primordial atmosphere of the earth could NOT possibly have combined
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nitrogen
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oxygen
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hydrogen
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methane
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Modem synthetic theory of evolution has emerged as a result of the studies on
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population dynamics
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gene recombination
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hybridization between species
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population isolation
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The correct sequence of evolution leading to present-day horses is
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Eohippus, Miohippus, Merychippus, Pliohippus, Equus
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Eohippus, Pliohippus, Merychippus, Orhippus, Equus
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Eohippus, Mesohippus, Orhippus, Merychippus, Pliohippus. Equus
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Eohippus, Merychippus, Miohippus
Orhippus, Equus
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Which one of the following correctly defines point mutation?
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Changes in the location of a block of genes in the chromosomes
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Inversion of a block of genes within a chromosome
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Loss of a segment of DNA containing one or several genes from a chromosome
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Alteration in the DNA sequence of a gene and passing of the new nucleotide sequence to the offspring
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Which one of the following statements is NOT correct regarding mutation?
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Mutations are changes either in the genes or in the chromosomes
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Mutations may be dominant or recessive
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Mutations are always recessive
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Recessive gene mutations may remain dormant for generations
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