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How does light intensity control plant seed germination?

Plants contain a type of pigment called phytochrome, which are sensitive to light. Phytochrome exists in two forms: phytochrome red and phytochrome far-red. Wh...

Answered by Daniella G. • Biology tutor

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Describe the events that take place in a neurone which produce an action potential

The action potential begins when the stimulus exceeds the threshold.
- The voltage gated sodium ion channels open.
- Sodium ions diffuse into the axon down an electrochemical gradient.
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Answered by Lauren G. • Biology tutor
12807 Views

What are the stages of drug testing?

The first stage when a new drug is developed is to model how it is expected to behave in the human body, test animals and individual cells on a computer. This ...

Answered by Savannah W. • Biology tutor

21084 Views

What is the difference between DNA and RNA?

DNA is a double helix, made up of two polynucleotide strands. RNA is comprised of only one polynucleotide strand.

The sugar in the sugar-phosphate backbone of DNA is deoxyribose, whereas ri...

Answered by Claire B. • Biology tutor

25642 Views

Describe and explain the function alveoli

Just to some basics:Gas exchange of carbon dioxide and oxygen occurs in the alveoli, small sac shaped branches of the lungs, grouped together similarly to grapes. When you breathe in, oxygen from the inha...

Answered by Anh-Duong V. • Biology tutor

15911 Views