National Standard Examination in Biology (NSEB) Solved Paper 2016 Part-9

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Q: 53. Which of the following may result in allopatric speciation?

(A) Rising sea levels submerging islands

(B) Polluted waters destroying coral reefs

(C) Torrential rains changing course of wide rivers

(D) Uncontrolled logging destroying forests

Answer: (C)

Q: 54. Hydrophobic interaction influence protein structure at which of the following level/s?

(i) Primary structure

(ii) Secondary structure

(iii) Tertiary structure

(iv) Quaternary structure

(A)

(B)

(C)

(D)

Answer: (C)

Q: 55. Fish normally swim with dorsal surface towards light. Tow fish A and B showed following response to light. Mark correct interpretation. (Arrow indicates light source.)

Q 55 Image of Fish normally swim with dorsal surface towards light

Fish Normally Swim with Dorsal Surface Towards Light

Q 55 Image of Fish normally swim with dorsal surface towards light

(A) B is normal fish & A with gravity sensor removed

(B) B is normal fish & A with one eye removed

(C) B is normal fish & A with photoreceptor dysfunction (Unequal stimulation).

(D) A has gravity sensor dominant over light sensor & B light sensor dominant over gravity sensor

Answer: (A)

Q: 56. In a cloning experiment, DNA ligase used shows optimum activity at 37°C and a segment of DNA that needs to be ligated shows 18°C as its Tm (melting temperature). Which of the following conditions will give best results of the ligation experiment?

(A) Experiment performed between 18°C and 37°C

(B) Experiment quickly performed at 18°C

(C) Experiment performed at temp above 18°C but less than 37°C

(D) Experiment performed at 8-10° temp over a prolonged period

Answer: (D)

Q: 57. The difference between excitatory and inhibitory response across a synapse is mainly due to:

(i) Intensity of voltage through synaptic space

(ii) Type of neurotransmitter

(iii) Type of gated channel opened in response to neurotransmitter

(A)

(B)

(C)

(D)

Answer: N/A

Q: 58. If a fluorescing protein is attached to many free ribosomes in a cell and the cell is photographed after a time interval, the colour will appear

(A) In cytoplasm only

(B) In cytoplasm and along rough endoplasmic reticulum and along wall of nucleus

(C) In cytoplasm, along rough endoplasmic reticulum and along wall of nucleus

(D) In cytoplasm, along rough endoplasmic reticulum, along wall of nucleus and in the matrix of mitochondria

Answer: (C)

Q: 59. Choose the statements that represent the effect of adrenal activation through sympathetic stimulation due to stress.

(i) Glycogenosis resulting in increased blood glucose

(ii) Breakdown of proteins and lipids leading to gluconeogenesis

(iii) Increased breathing rate

(iv) Retention of sodium and water by kidneys

(v) Increased metabolic rate

(A)

(B)

(C)

(D)

Answer: (D)

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