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Question 1

Describe the sequence of transcription

Answer 1

1. Two strands of DNA are unzipped
2. RNA polymerase attaches to the DNA
3. RNA polymerase moves along the DNA strand
4. The newly formed strand of mRNA is ready to leave the nucleus

Question 2

Describe the sequence of translation

Answer 2

1. mRNA travels through cytoplasm into the ribosome
2. For every codon the ribosome lines up one complementary molecule of tRNA
3. tRNA carries amino acids
4. Anticodon attached to codon
5. Used tRNA exit the ribosome and collect another amino acid in the cytoplasm
6. A chain is eventually build up, this is called a polypeptide

Question 3

What does progesterone do and where is it produced

Answer 3

• Produced in the female ovaries
• Used for maintaining the uterus lining during pregnancy
• It stops the release of FSH and LH which releases the eggs

Question 4

What does Oestrogen do and where is it porduced

Answer 4

• Produced by the female ovaries
• Used for the development of secondary sexual characteristics in females and regulating the menstrual cycle
• Causes growth and repair of the lining of the uterus wall

Question 5

How is the ADH used in osmoregulation

Answer 5

• Water content of the blood falls below a certain level if dehydrated
• More ADH will be released
• Collecting ducts more permeable for water to be reabsorbed

Question 6

WHere is LH and FSH produced and what do they do

Answer 6

• Released in the pituitary gland
• LH: Stimulates the ovary to produce progesterone
• FSH: Causes egg to start maturing in the ovary. It also stimulates the ovaries to start releasing oestrogen

Question 7

Eye change when looking at a near object

Answer 7

• Ciliary muscles contract
• Suspensory ligaments loosen
• Lens will be thincker and more light refracted

Question 8

Definition of biodiversity

Answer 8

The variety of different species present in the community of an ecosystemR