What I got wrong - Paper 1

Question 1

Plant cells have chloroplasts.

What happens in a chloroplast?

Answer 1

Oxygen gets produced and sunlight gets absorbed by chlorophyll

Question 2

Why is the three domain method of classification better?

Answer 2

Improved genetic analysis

Question 3

4 features of bacterial cells

Answer 3

• contain plasmids
• no nucleus
• cell wall
• ribosomes
• flagellum

Question 4

Describe lytic pathway:

Answer 4

With lytic phages, bacterial cells are broken open (lysed) and destroyed after immediate replication of the virion. As soon as the cell is destroyed, the phage progeny can find new hosts to infect.

Question 5

Describe lysogenic pathway:

Answer 5

• virus inserts dna
• dna joins host cell dna
• host cell divides by mitosis

Question 6

How can a mutation in the non-coding region for DNA can prevent a gene being transcribed

Answer 6

A mutation can turn on a gene and cause a protein to be produces in the wrong place or at the wrong time. It can also eliminate the production of an important protein when it is needed.

Question 7

How are impulses transmitted at synapses

Answer 7

The first neuron releases NEUROTRANSMITTERS. This DIFFUSES to the POSTSYNOPTIC NEURON, which stimulates an electrical impulse.

The receptor molecules on the second neuron can only bind to the specific neurotransmitters released from the first neuron.