NEET Zoology Full Syllabus Test Paper by TEACHING CARE online tuition and coaching classes

NEET Zoology Full Syllabus Test Paper by TEACHING CARE online tuition and coaching classes

  1. 1. Which statement about Down’s syndrome is correct? (D)
1.The frequency of this syndrome increases dramatically in mothers above 40.
2.The Down’s syndrome is cause d due to non-disjunction where in the chromosomes fail to separate during the first meiotic division.
3.Affected persons have an additional autosome.
4.The long time gap between the start of meiosis in ovarian tissue (during fetal development) and its completion (at ovulation) is most likely the reason for increased occurrence of this syndrome in older mothers.

Ans.D. Down’s syndrome is trisomy of 21st chromosome. It depends on the meiotic errors

during egg productions in females(non disjunction of paired chromosomes during

meiosis I), mother’s age and also Non disjunctions in men which is rare.

 

Q.2. Which of the events occur during the light reactions of photosynthesis? (D)

  1. Oxidation of water
  2. Reduction of NADP+
  3. Synthesis of ATP from ADP and Pi
  4. Reduction of water
  5. 1 and 2 only
  6. 1and 3 only
  7. 1,2 and 3 only
  8. 2, and 4 only

Ans. C. The following equation summarizes the events that take place during light

reactions of photosynthesis.

2 H2O + 2 NADP+ + 3 ADP + 3 Pi + light → 2 NADPH + 2 H+ + 3 ATP + O

 

  1. 3. Which one of the following structural property does not involve hydrogen bonding? M
  2. A) complementary base pairing in RNA
  3. B) protein primary structure
  4. C) protein secondary structure D) complementary base pairing in DNA

Ans B. Primary structure of protein refers to sequence of amino acids in the polypeptide    chain

  1. 4. Which of the following statements regarding an anticodon is correct. An anticodon is the sequence of the nitorgenous bases on the (M)
  2. mRNA molecule which instructs the ribosomes to initiate protein synthesis.
  3. complementary strand of mRNA which codes for one amino acid
  4. tRNA molecule where the amino acid is attached
  5. tRNA molecule which recognizes the appropriate sequence of bases on the mRNA.

Ans. D. Codon is present on mRNA. Anticodon is on tRNA during protein synthesis

 

Q.5 As compared to the single ribosomes, polyribosomes enhance the effeciency of translation because they enable (M)

  1. different kinds of proteins to be produced simultaneously
  2. many copies of the mRNA molecules to be read at the same time.
  3. More than one copies of the same protein are made simultaneously from a

single messenger RNA molecule.

  1. Polyribosomes have a faster rate of addition of amino acids in the

polypeptide chain

Ans C. In polyribosomes, many ribosomes are attached on the same mRNA

 

Q.6 Codon refers to ?( E)

  1. a part of the mRNA that has a sequence of nitrogenous bases coding for an

amino acid.

  1. a part of the tRNA to which a specific amino acid is attached.
  2. a part of the tRNA which recognises the triplet code on the mRNA
  3. a part of DNA which codes for a specific protein

Ans A codon is a sequence of three nitrogenous bases on mRNA that codes for a specific amino acid

 

Q.7. Urey and Miller simulated the primitive earth conditions in a spark chamber by using Hydrogen, Ammonia, Methane and Water vapours to demonstrate the chemical origin of life. The molecules that was found after the experiment was (M)

  1. Proteins B. Lipids C. Amino acids D. Polysaccharides

Ans. C Amino acids were produced in Miller and Urey’s experiment

Q.8. Cri-du-chat syndrome in man is a genetic disorder that develops due to ( M)

  1. Trisomy in chromosome 13
  2. deletion in the short arm of 5th chromosome
  3. deletion in the short arm of chromosome 18
  4. Translocation between chromosomes 22 and 9

Ans. B

 

Q.9. ELISA test is used to detect HIV, however, the confirmation of HIV infection is done with the help of (E)

  1. Southern blotting b. Western blotting c. Northern blotting d. DNA finger printing

Ans. B. Southern blotting for DNA . Western blotting for proteins . Northern blotting for RNA

 

Q.10. An ecological adaptation in which the Stick insect and Leaf insects resemble the twigs and leaves of plants respectively to escape from the predators. This phenomenon is known as (D)

  1. Homology B. Analogy C. Camouflage D. Mimicry

Ans. D. In mimicry , there is one model and one mimic whereas camouflage is to blend/mix with the surrounding background. Here, Stick insect and Leaf insects act as mimics

 

Q.11.The adaptations of Darwin’s finches on the Galápagos Islands, to different sources of food through changes in their beak structure resulted in (D)

  1. a decreased predation on finches
  2. an increased species diversity of finches
  3. an increased competition among finches
  4. a decreased reproductive rate in finches

Ans B. Adaptations in different directions lead to speciation in different directions

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