Cellular Metabolism

Question 1

Define cellular metabolism

Answer 1

The biochemical processes in cells

Question 2

Describe the important roles of the inner membranes of the chloroplast and mitochondria floor photosynthesis and respiration

Answer 2

Mitochondria: cristae contain enzyme and coenzymes for the process of aerobic respiration facilitated cycle. Respiration is facilitated by the Krebs cycle.

Chloroplast: have thylakoid (one of the stacks of granum) contain chlorophyll, with increased surface area by arrangement. Enzymes that facilitate photosynthesis occur within the Calvin cycle.

Both: have own DNA which allows for a protein template, ribosomes are able to synthesise own proteins/enzymes and increased SA means there is more room for ribosomes and enzymes to be attached.

Question 3

Why is a different enzyme required at each step in a metabolic pathway?

Answer 3

Due to the specialised active sites

Question 4

What occurs in a metabolic pathway when an enzyme does not work?

Answer 4

Accumulation of substances

Question 5

What is released at each step of a metabolic pathway?

Answer 5

Heat

Question 6

Why are many processes done in regulated steps?

Answer 6

Controlled energy release, intermediates, homeostasis (even amount of energy release)

Question 7

What kind of chemicals can interfere with cell metabolism?

Answer 7

Penicillin, carbon monoxide, lead, cyanide, hydrogen sulphide