Biology

Question 0

Tissue vs Organ

Answer 0

Tissue - similar cells, particular function.

Organ - different tissues, particular function.

Question 1

Protozoans = ?

Answer 1

Single called organisms

Question 2

Where is amylase / protease / lipase produced?

Answer 2

Amylase - pancreas, small intestine.

Protease - stomach, pancreas, small intestine.

Lipase - pancreas, small intestine.

Question 3

Bile does what? Stored where?

Answer 3

Neutralises stomach acid and emulsifies fats. Gall bladder.

Question 4

Order of nervous response = ?

Answer 4

(stimulus) –> sensory –> relay –> CNS –> motor –> effector

Question 5

Describe the different neurone structures.

Answer 5

Sensory - long dendrite, short axon.

Relay - many short dendrites and axons.

Motor - many short sentries, long axon.

Question 6

What monitors temperature?

Answer 6

Hypothalamus - hairs flatten + sweat.

Question 7

Blood sugar too high = ?

Answer 7

Insulin –> glucose removed as glycogen in liver + muscles.

Question 8

Kidney…

Answer 8

Removal of urea / ion + water adjustment.

Ultrafiltration –> Reabsorption –> Waste Released. Nephrons.

Excess amino acids –> carb + fat.

Question 9

Where is ADH produced?

Answer 9

Pituitary Gland. Alcohol decreases ADH / ecstasy increases.

Question 10

Describe the Nitrogen Cycle.

Answer 10

1. N Fixation - lightning (N + O) or bacteria.
2. Decomposition - decomposers turn proteins / urea into ammonium compounds.
3. Nitrification - nitrifying bacteria change ammonium compounds into nitrites then nitrates.
4. Denitrification - denitrifying bacteria turn nitrates into N gas (they respire the nitrates in anaerobic conditions).