The Online Biology Olympiad, Final Round. Objectives test three(Nervous system and Nervous coordination, Enzymes, Immune system, Immunology). Duration: 10 minutes, 15 marks.

1.

1 point

The enzyme which forms the peptide bond is known as ........

carbohydrase

carbonic unhydrase

peptidyl transferase

peptidase

2.

1 point

Which part of the human brain is concerned with the regulation of body temperature and urge for eating?

medulla oblongata

cerebrum

cerebellum

hypothalamus

3.

1 point

Visual area is located in the ........

temporal lobe

parietal lobe

occipital lobe

frontal lobe

4.

1 point

All the following comes under non-specific defence mechanism except ..........

phagocytes

cell mediated immunity

complement system

fever

5.

1 point

When an axon is at rest, the concentration of ions on either sides of the membrane are different. Which of the following statements is correct about the concentration of ions on either sides of the membrane?

Cl- ions and K+ ions begin to move across the membrane

there is an excess of Na+ ions on the inner side of the axon

the inside of the axon becomes positively charged, while the outside is negatively charged

there is an excess of K+ ions inside the axon and an excess of Na+ ions outside

6.

1 point

Newborns get their antibodies from mothers milk. This is an example of .........

naturally acquired active immunity

naturally acquired passive immunity

artificially acquired passive immunity

artificially acquired active immunity

7.

1 point

Playing harmonium is an example of ........

long term homeostasis

conditioned reflex

resdiual learning

short term homeostasis

8.

1 point

Alzheimer's disease in humans is associated with the deficiency of ..........

dopamine

acetylcholine

glutamic acid

gamma aminobutyric acid

9.

1 point

Vaccination is an example of .......

naturally acquired passive immunity

naturally acquired active immunity

artificially acquired active immunity

artificially acquired passive immunity

10.

1 point

One but all is an example of the action of the autonomous nervous system:

swallowing of food

peristalsis of the intestine

knee jerk response

papillary reflex

11.

1 point

The protective covering of the brain is?

pleura

pericardium

meninges

peritoneum

12.

1 point

During the propagate ion of a nerve impulse, the action potential results from the movement of ..........

K+ ions from the intracellular fluid to the extracellular fluid

Na+ ions from intracellular fluid to extracellular fluid

K+ ions from extracellular fluid to intracellular fluid

Na+ ions from extracellular fluid to intracellular fluid

13.

1 point

The Nissl granules of nerve cells are made up of?

DNA

ribosomes

proteins

RNA

14.

1 point

Enzymes are .........

proteins

fats

carbohydrates

RNA

15.

1 point

When an electric shock is given to the leg of a pithed frog, it .........

shows no response

puts out its tongue

shows reflex response by contraction of leg muscles

blinks its eyes

16.

1 point

Which of the following is developed in the nervous system?

elasticity

contractility

rigidity

excitability

17.

1 point

Most industrial enzymes are obtained from .........

animal tissues

microbes

plants

insects

18.

1 point

Which one of the following illustrates a reflex arc?

muscles->spinal cord->brain

brain->spinal cord->muscles

receptor->spinal cord->muscles

muscle->receptor->brain

19.

1 point

In vertebrates, simple reflex action is ..........

polysynaptic

monosynaptic

trisynaptic

bisynaptic

20.

1 point

Enzymes having slightly different molecular structures but performing identical activity are known as .......

coenzymes

holoenzymes

isoenzymes

apoenzymes