Top answers

How are signals transmitted across the synaptic cleft?

When the action potential reaches the synaptic knob it causes voltage-gated calcium ion channels to open, allowing calcium ions to diffuse in. These calcium ions cause synaptic vesicles containing acetylchol...
DE
Answered by Dani E. • Biology tutor
4598 Views

A guanine is swapped for a thymine in a gene sequence. Explain how this may alter the function of the protein it translates.

The alteration in the nucleotide sequence of the gene may result in a change in the amino acid sequence of the protein during translation. Each set of three RNA nucleotides (anticodon) is recognised by a rib...
MD
Answered by Matthew D. • Biology tutor
4461 Views

Describe how plants react to the environmental factor of Light

One environmental factor which has an effect on a plant is light. The stems of a plant grow towards the light, and roots grow away from the light. We call this phototropism (Photo = Light and Tropism = movem...
EA
Answered by Ellie A. • Biology tutor
2835 Views

What are the main similarities and differences in the structure of plant and animal cells?

Animal cells have the following organelles: A nucleus which controls the activities of the cell and stores the cell DNA; cytoplasm where most of the cell's chemical reactions take place; a cell membrane whic...
AW
Answered by Amy W. • Biology tutor
4797 Views

What is the difference between diffusion, osmosis and active transport?

Diffusion Diffusion is the process in which particles/ substances spread out in a solution or a gas. The result of this process is that particles move down the concentration gradient from an area of high con...
AW
Answered by Amy W. • Biology tutor
97420 Views