Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

41.

DNA replication in bacteria occurs

  • During S-phase

  • Within nucleolus

  • Prior to fission

  • Just before transcription


C.

Prior to fission

DNA replication in bacteria occurs prior to fission. Prokaryotes do not show well marked S-phase due to their primitive nature

2185 Views

42.

Phosphoenol pyruvate (PEP) is the primary CO2 acceptor in :

  • C3 plants

  • C4 plants

  • C2 plants

  • C3 and C4 plants


B.

C4 plants

1096 Views

43.

Which of the following options best represents the enzyme composition of pancreatic juice?

  • Amylase, peptidase, trypsinogen, rennin

  • Amylase, pepsin, trypsinogen, maltase

  • Peptidase, amylase, pepsin, rennin

  • Lipase, amylase, trypsinogen, procarboxypeptidase


D.

Lipase, amylase, trypsinogen, procarboxypeptidase

Rennin and Pepsin enzymes are present in the gastric juice. Maltase is present in the intestinal juice.

2660 Views

44.

MALT constitutes about ___________ percent of the lymphoid tissue in human body.

  • 50%

  • 20%

  • 70%

  • 10%


A.

50%

1955 Views

45.

The morphological nature of the edible part of coconut is

  • Perisperm

  • Cotyledon

  • Endosperm

  • Pericarp


C.

Endosperm

1120 Views

46.

Hypersecretion of Growth Hormone in adults does not cause further increase in height, because

  • Growth Hormone becomes inactive in adults

  • Epiphyseal plates close after adolescence

  • Bones loose their sensitivity to Growth Hormone in adults

  • Muscle fibres do not grow in size after birth


B.

Epiphyseal plates close after adolescence

Epiphyseal plate is responsible for the growth of bone which close after adolescence so hypersecretion of growth hormone in adults does not cause further increase in height.

1602 Views

47.

Which of the following components provides sticky character to the bacterial cell?

  • Cell wall

  • Nuclear membrane

  • Plasma membrane

  • Glycocalyx


D.

Glycocalyx

Sticky character of the bacterial wall is due to glycocalyx or slime layer. This layer is rich in glycoproteins

1254 Views

48.

Myelin sheath is produced by

  • Schwann Cells and Oligodendrocytes

  • Astrocytes and Schwann Cells

  • Oligodendrocytes and Osteoclasts

  • Osteoclasts and Astrocytes


A.

Schwann Cells and Oligodendrocytes

Oligodendrocytes are neuroglial cells which produce myelin sheath in central nervous system while Schwann cell produces myelin sheath in peripheral nervous system.

1069 Views

49.

Receptor sites for neurotransmitters are present on

  • Membranes of synaptic vesicles

  • Pre-synaptic membrane

  • Tips of axons

  • Post-synaptic membrane


A.

Membranes of synaptic vesicles

Pre-synaptic membrane is involved in the release of neurotransmitter in the chemical synapse. The receptors sites for neurotransmitters are present on post-synaptic membrane

1074 Views

50.

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?

  • Chromosomes will not condense

  • Chromosomes will be fragmented

  • Chromosomes will not segregate

  • Recombination of chromosome arms will occur


C.

Chromosomes will not segregate

Anaphase Promoting Complex (APC) is a protein necessary for separation of daughter chromosomes during anaphase. If APC is defective then the chromosomes will fail to segregate during anaphase.

1309 Views