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What is mRNA?

mRNA is one of the 3 types of RNA: the others being tRNA and rRNA. They all play a role in protein synthesis. mRNA stands for messenger ribonucleic acid. It is made by copying a strand of DNA called the temp...
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Answered by Lucie C. • Biology tutor
22310 Views

What are the different types of transport across a membrane?

The different types of transport across a membrane can be divided into two main categories: active and passive transport. Active transport requires metabolic energy in the form of ATP and molecules are moved...
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Answered by Steph F. • Biology tutor
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Why is the left side of the heart more prominent than the right side?

There are two sides of the heart and each side (left and right) has two chambers each. The two chambers: atria (top) and a ventricle (bottom). Even though the two sides of the heart have two chambers each, t...
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Answered by Timi S. • Biology tutor
20939 Views

State three factors which effect enzyme activity. (3)

With this question you really have to take into account how many marks you are given (in fact I'd say this is the case in most biology questions) as you want to make sure you have made one point per mark giv...
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Answered by Annabelle S. • Biology tutor
8081 Views

How do sodium and potassium ions travel through the cell membrane?

the sodium-potassium pump enables the passage of sodium and potassium ions. Both of which must be present. This uses energy as it is done via active transport. They move across their concentration gradient.
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Answered by Megan B. • Biology tutor
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