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How do we control the concentration of urine?

Osmoregulation is the homeostasis of water in the body. It is important that water volumes are kept relatively constant as this influences electrolyte concentrations and cell activity. There are many ways in...
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Answered by Adam B. • Biology tutor
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What does the term "Semi-conservative" mean in relation to DNA?

DNA is a double stranded helix. During DNA replication, the strands are separated from each other (using an enzyme called DNA helicase). The unzipped DNA strands then utilize another enzyme, known as DNA Pol...
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Answered by Catherine A. • Biology tutor
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Membranes of pre-synaptic and post-synaptic neurons play an important role in transmission of nerve impulses. Explain the principles of synaptic transmission. (8marks)

Synapse is the gap between two adjacent neurons in which neurotransmitters are released. Arriving action potential depolarises pre-synaptic membrane. This causes voltage gated calcium channels in membrane to...
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Answered by Alla K. • Biology tutor
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What process of chromosome replication is used to produce gametes?

Meiosis. Meiosis produces genetically different haploid daughter cells. Mitosis is the other method of chromosome replication but it produces diploid clone daughter cells. If sperm and eggs were produced thi...
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Answered by Lucy C. • Biology tutor
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Explain the role of T-cells in immune response to viral infection

When T cells bind to viral antigens presented by macrophages they undergo mitosis to form 4 distinct cell variants: Memory T cells- remain in the blood stream to initiate a faster immune response upon re-exp...
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Answered by Will S. • Biology tutor
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