Past Paper Corrections

Question 1

What makes embryonic stem cells differentiate and replace any damaged tissue?

Answer 1

Pluripotent and all genes can be switched on

Question 2

Explain why electrons are passed through the membrane and then how is atp produced -2

Answer 2

Movement of electrons releases energy to pump hydrogen ions

Flow of hydrogen ions through ATP synthase which generates atp

Question 3

How is genetic material stored in a mitochondria?

Answer 3

Circular chromosomes

Question 4

Where is circular chromosomes found in Eukaryotes

Answer 4

Chloroplasts, mitochondria

Question 5

What two functions do non coding regions of the genome do?

Answer 5

Regulate transcription
Transcribed to tRNA

Question 6

What does the dependent variable show

Answer 6

The thing that is measured as you change something else

Question 7

What is synthesised by the process of translation?

Answer 7

A polypeptide

Question 8

Describe alternative mRNA splicing

Answer 8

Different exons are translated from the same primary transcript

Question 9

Describe sweating in correlation to a decrease in body temperature

Answer 9

Heat energy is evaporated from skin as sweat cools the skin.

Question 10

What is the general term for a control system that responds to changes in physiology by acting to restore the normal value?

Answer 10

Homeostasis

Question 11

Describe feedback inhibition

Answer 11

End products is too high at a critical temperature

The end product in high production so it inhibits the enzyme to prevent it from changing shape

Question 12

Benefit of kin selection

Answer 12

Increase survival of shared genes

Question 13

What is mitosis

Answer 13

Cell replication of the same nuclei

Question 14

Complex compounds in agar jelly

Answer 14

Vitamins/fatty acids/beefy extract/amino acids

Question 15

What components makes up a ribosome

Answer 15

Protein and rRNA

Question 16

Explain how protein synthesis decreases if a change in sequence of bases

Answer 16

Ribosome is not formed/ mRNA cannot join to ribosome/ change in structure or function or shape of the ribosome/

Question 17

Name a bond that holds the polypeptide chain in shape?

Answer 17

Hydrogen bonds

Question 18

Why is the lagging strand in fragments

Answer 18

DNA is replicated from the 5’ to 3’ end

Question 19

Why does DNA replication occur?

Answer 19

To have An Exact copy of Genetic material is passed to new cell

Question 20

What is the independent variable?

Answer 20

The variable that you change

Question 21

Are meristems specialised or unspecialised

Answer 21

Unspecialised

Question 22

What is a benefit of bacteria of secondary metabolites in a ecological way?

Answer 22

Allows them to put compete other microorganisms

Question 23

Explain why in vasoconstriction get narrower?

Answer 23

Reduces blood flow to the skin which stops heat loss

Question 24

Give the term used for animals which can control their internal temperature by negative feedback?

Answer 24

Thermoregulation

Question 25

Name the bond which in adjacent and holds amino acids together?

Answer 25

Peptide

Question 26

Name the bond that made between complementary bases

Answer 26

Hydrogen