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What are the differences between eukaryotes and prokaryotes

Eukaryotes: animals and plantsmany eukaryotes are complex, multicellular organisms cells contain membrane bound organelles (such as a nucleus) Prokaryotes: bacteria and archaeasingle celled organismsdo not c...
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Answered by Verity G. • Biology tutor
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Explain how evolution by natural selection works.

Variation among genes codes for different phenotypes in a population. Individuals that have a phenotype that is better suited to their environment are more able to survive and reproduce, and therefore, have ...
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Answered by Eleanor S. • Biology tutor
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What occurs during the metaphase stage of mitosis?

Metaphase is the third stage of mitosis, following Interphase and Prophase. During interphase, the cell replicates its organelles and centrosomes and synthesis of specific proteins for mitosis occurs. During...
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Answered by Josephine M. • Biology tutor
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What is the difference between xylem and phloem tubes?

Xylem passively and unidirectionally transports water (by osmosis) from the roots to the leaves of a plant, whereas phloem uses active transport to bidirectionally transport food from the leaves to growing p...
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Answered by Taha S. • Biology tutor
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Explain how blood glucose levels are controlled in the body of someone who does not have diabetes.

If blood sugar levels are too high insulin is released from the pancreas so glucose is moved into cells. If blood sugar levels are too low glucagon is released and stimulates conversion of glycogen to glucos...
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Answered by Isabelle L. • Biology tutor
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