2022

Question 1

Describe how the base pairs are bonded together in a DNA molecule.

Answer 1

weak

hydrogen bonds (1)

complementary bases

Question 2

what is the use of protease

Answer 2

breaks down
proteins

in the cell
membrane

Question 3

why ice cold ethanol was poured into the filtrate

Answer 3

to precipitate the DNA
because DNA is insoluble in
ethanol

Question 4

State the sense most likely to be affected if the occipital lobe is damaged.

Answer 4

sight

Question 5

Explain how HIV can lead to the onset of AIDS.

Answer 5

HIV destroys white blood
cells
which weakens the
immune system making the
person more prone to
other pathogens

Question 6

how do bacterias developed resistance
to antibiotics

Answer 6

-by natural selection
evolution
-mutation in the bacterium
variation in the population
-the resistant bacteria
reproduce
-inhertitance

Question 7

Describe the stages of antibiotic development that would occur after the
discovery of a new antibiotic

Answer 7

-the antibiotic would go through
a development phase
-trials
tested on animals

Question 8

what is produced when a single cell divides by mitosis

Answer 8

two cells
genetically identical
cells

Question 9

State the effect of cancer on cell division.

Answer 9

uncontrolled

Question 10

why human stem cells are used

Answer 10

undifferentiated and can take any form
wont be rejected