Top answers

Biology
A Level

How do negative and positive feedback loops occur and how are they different?

Think of them as a flow chart.

Stimulus (a change)
    |
Sensor (detects the change)
    |
Control (sends a signal about t...

EC
Answered by Emma C. Biology tutor
7875 Views

How to write an essay on: The importance of proteins in the control of processes and responses in organisms.

Explain the use of proteins as enzymatic catalyats - including examples.

Enyzmes control metabolic pathways - such as in the Krebs cycle.

Proteins/enzymes in photosynthesis - with examples.<...

EB
Answered by Eva B. Biology tutor
36773 Views

Describe the process of extracellular digestion

Extracellular digestion is a process in which an organism feeds by secreting enzymes through its cell membrane and on to the food. These enzymes then catalyse the breakdown and the digestion of the food. ...

SN
Answered by Stuart N. Biology tutor
8976 Views

What are the risks and benefits concerning genetic modification of crops?

With the world population increasing exponentially, the concept of genetic engineering can be viewed as a sustainable way to feed people. Crops can be genetically modified to improve certain characteristi...

AA
Answered by Alyssa A. Biology tutor
5097 Views

The drug Atropine blocks the action of of acetylcholine on structures innervated by post-ganglionic cholinergic neurones.

State precisely which part of the nervous system will be affected by atropine and suggest why atropine might be used during anesthesia.

Answer:

It acts on the parasympathetic branch of the a...

RM
Answered by Rana M. Biology tutor
4613 Views

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