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Explain what 5' and 3' ends mean in regards to DNA structure?

5' and 3' ends describes the directionality of the DNA molecule. Essentially, the strand of a DNA molecule can have a 5' end and a 3' end. To understand what a 5' or 3' end is, we need to look at the molecul...
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Answered by Nathalie A. • Biology tutor
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Explain what advantage a large surface area to volume ratio will provide for a penguin living in Antarctica

A large surface area to volume ratio will decrease the rate of heat loss from the penguin. In the cold environment of Antarctica this means that the penguin needs to expend less energy to maintain its body t...
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Answered by Adi R. • Biology tutor
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Muscle cells from the stomach have a characteristic tear-drop shape with a grainy cytoplasm containing mitochondria and a nucleus. Describe the function of these cells in the wall of the stomach

These muscle cells are known as a type of cell called smooth muscle. They serve to contract/shorten regularly in unison in a process known as peristalsis. This allows the food to be mixed with each other, as...
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Answered by Simran D. • Biology tutor
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Describe the process of evolution by natural selection

Think of two animals of the same species. One of them has a gene that contains mutation X. Mutation X helps this animal to be better adapted to survive as it makes them stronger, and more likely to find food...
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Answered by Sara M. • Biology tutor
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What is the definition of a competitive enzyme inhibitor?

A competitive enzyme inhibitor is a molecule which has a similar structure to the target molecule (substrate). It acts by binding to and blocking the active site of the enzyme. This prevents the substrate fr...
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Answered by Olivia W. • Biology tutor
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