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Question 1

How is measles spread?

Answer 1

Through inhalation of droplets eg coughing and sneezing

Question 2

1.What is the walls of xylem made of?
2.How does the structure of phlegm allow cell Sal to move between phloem cells?
3.Why is the rate of transportation low at night time?

Answer 2

1.Lignin
2.They have pores at in the end walls for the cell sap to move through
3.Photosynthesis cannot happen in the dark due to no light energy being absorbed by chloroplast, so the stomata do not need to open to allow carbon dioxide inside the leaf. So less water can escape.

Question 3

What is urea and how is it removed?

Answer 3

The waste product when excess protein is broken down, removed by the kidney as urine

Question 4

1.What are two types of chemical defense responses by plants?
2.How does bacteria cause cell and tissue damage?
3. How can fungi cause and spread disease?

Answer 4

1.Release poisons to deter herbivores,secrete antibacterial chemicals
2.Releases toxins that damage cells and tissues, making one feel ill
3.produce spores which can be spread

Question 5

Describe some enzyme controlled reactions in which large molecules and made from smaller ones
Bioenergetics

Answer 5

Combining glycerol and fatty acids to make lipid molecules
Combining glucose and nitrate ions to make amino acids which combine to make proteins
Joining glucose molecule to form starch of glycogen or cellulose

Question 6

What does an IUD do?

Answer 6

Prevents implantation of an embryo

Question 7

What does progesterone do?

Answer 7

Maintains uterus lining, inhibits release of FSH and LH from pituitary gland. Provides a cervical mucus, preventing sperm entering uterus

Question 8

What is gene therapy?

Answer 8

Replace faulty alleles with healthy alleles
Similar to embryo screening

Question 9

Two types of contact lenses?
What do the branches in an evolutionary tree show?

Answer 9

Soft and hard
Where speciation has occurred

Question 10

What percentage of energy from light intensity is transferred to the next tropic level?

Answer 10

1%

Question 11

How do decomposes work?

Answer 11

They release enzymes with catalyze the breakdown tbe molecules into smaller molecules and organic matter

Question 12

What is a zero error?
Why can be not reduce it by doing repeats?
How do we solve this?

Answer 12

A reading on a measuring instrument when the value should be zero
Because it is a systematic error not a random error
Subtract the zero error from all of the readings