ATAR Notes: Forum

VCE Stuff => VCE Science => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Biology => Topic started by: ct:) on June 02, 2012, 11:36:00 pm

Title: What does heterotroph and autotroph mean?
Post by: ct:) on June 02, 2012, 11:36:00 pm

What does heterotroph and autotroph mean?

Title: Re: What does heterotroph and autotroph mean?
Post by: anonymous1 on June 03, 2012, 01:49:39 am

autotrophs can synthesize their own organic compounds, for example plants and some bacteria (cyanobacteria), whereas heterotrophs must obtain organic compounds via nutrients

Title: Re: What does heterotroph and autotroph mean?
Post by: ct:) on June 03, 2012, 11:46:32 am

thanks, but where does the nutrient come from for heterotrophs? :P

Title: Re: What does heterotroph and autotroph mean?
Post by: anonymous1 on June 03, 2012, 11:57:37 am

they eat animals which eat plants or they can directly eat plants, plants make organic compounds :)

Title: Re: What does heterotroph and autotroph mean?
Post by: ct:) on June 03, 2012, 05:42:19 pm

ohh, thankyou :)

another question is:

Cats that have not been fed for 2-3 days are able to maintain a constant blood glucose concentration. After 24 hours without food, the structure from which glucose is realeased into the cat's blood is the:

a) liver
b) brain
c) pancreas
d) digestive system

I said c) pancreas, but the answer is actually a) liver , why is it in the liver not pancreas? :P

Title: Re: What does heterotroph and autotroph mean?
Post by: jasoN- on June 03, 2012, 05:43:41 pm

After 24 hours without food, the BG levels are low.
This stimulates glucagon release from alpha cells of the pancreas (what probably confused you), which stimulates liver and kidney cells (mainly liver though!) to release glucose from stored glycogen into the blood.

edit: oops, didn't see cats are able to maintain constant BGL... well regardless, it's the liver releasing glucose (from glycogen) into the blood

Also the pancreas doesn't release glucose. It only releases glucagon and insulin, which stimulate the uptake/release of glucose.

Title: Re: What does heterotroph and autotroph mean?
Post by: ct:) on June 03, 2012, 05:53:16 pm

so glucagon is released by the pancreas which then converts to glucose when needed? and insulin produced by the pancreas converts glucose into glycogen as energy storage in the liver? is that right? :S haha

Title: Re: What does heterotroph and autotroph mean?
Post by: jasoN- on June 03, 2012, 05:56:23 pm

Glucagon stimulates release of glucose (from glycogen - which is the storage form of glucose, i.e. lots of glucose joined together = glycogen)
Insulin stimulates uptake of glucose into cells, where it's used as an energy source, or stored as glycogen

Title: Re: What does heterotroph and autotroph mean?
Post by: ct:) on June 03, 2012, 11:49:34 pm

When does clonal expansion happen?

Title: Re: What does heterotroph and autotroph mean?
Post by: scar on June 04, 2012, 02:42:33 pm

Clonal Expansion is when a particular B cell is activated (the one who can make an antibody that fits with a specific antigen) it clones itself and forms plasma cells and memory cells!

Title: Re: What does heterotroph and autotroph mean?
Post by: ct:) on June 10, 2012, 12:01:31 pm

does kreb cycle occur in the matrix, the inner compartment of mitochondria? and does electron transport occur in the cristae, the inner membrane of mitochondria?

what is the difference between cytochrome and cristae?