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Biology
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Part of the retina of a young rat was removed and kept in the dark for two hours. This allowed the pigment in the rod cells to recover from bleaching caused by exposure to light. Suggest what happens in the rod cells during this two hours of darkness.

Rhodopsin is the pigment found in rod cells, which consists of cis-retinal and the protein opsin. When the rod cells are kept in darkness, the opsin is uncoupled from the cell surface membrane of the rod ...

Answered by Panos L. Biology tutor
4232 Views

Explain how the sinoatrial node (SAN) ensures that oxygenated blood enters the aorta.

The sinoatrial node is a region found on the right atrium which acts as a pacemaker. Cells at the SAN can depolarise (become more positively charged with respect to the outside) and generate electrical ac...

Answered by Panos L. Biology tutor
8391 Views

Describe the structure of DNA.

DNA is comprised of many 'building blocks' known as deoxyribose nucleoside triphosphates (dNTPs). Each dNTP is made of a base (adenine, guanine, cytosine or thymine), bonded to a 5-carbon sugar molecule a...

Answered by Victoria J. Biology tutor
2042 Views

Respiration and photosynthesis-what are the similarities and differences?

Respiration in both animals and plants Photosynthesis only in plants Will explain further in interview

Answered by Abuzar A. Biology tutor
2228 Views

State three differences between daughter cells produced by the process of mitosis and those produced by meiosis.

Meiosis is a type of cell division that only occurs in the sex organs, testes and ovaries, mitosis occurs in every cell in the body, these are somatic cells. Daughter cells are the cells that are produced...

Answered by Urma C. Biology tutor
19246 Views

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