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What is the function of T-helper cells?

T-helper cells are a kind of lymphocyte that are a key part of the adaptive immune system. The adaptive immune system is largely coordinated by T cells, of which there are several types, and B cells, the oth...
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Answered by Theo F. • Biology tutor
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Explain the Cardiac Cycle

Deoxygenated blood from the body drains into the right atrium of the heart through the superior and inferior vena cava blood vessels. The blood then travels from the right atrium, through the tricuspid valve...
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Answered by Simi P. • Biology tutor
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Mutations of a DNA sequence could alter the expression of a gene. Describe and explain the process of gene expression and how a mutation could lead to disease.

DNA is a universal code for all living beings known to man. There are four nucleotide bases in DNA and RNA, the combinations of these sequences are what determine the order and length of a polypeptide. Every...
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Answered by Omar S. • Biology tutor
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How can natural selection and isolation lead to speciation?

What is speciation?When a new and distinct species evolves from an ancestor speciesReproductively isolated from the ancestor/other species2. How does natural selection work?a. Population of individuals, with...
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Answered by Laura P. • Biology tutor
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What is the electron transport chain and what is its function?

The electron transport chain is a series of four protein complexes , along with accessory electron carriers, e mbedded in the inner mitochondrial membrane of mitochondria . The enzyme ATP synthase is closely...
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Answered by Joshua J. • Biology tutor
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