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What is a Sodium Potassium Pump? How does it work?

The sodium potassium pump (sodium potassium ATPase) is an enzyme found in the membrane of all animal cells. Its job is to move NA+ out of the cell and K+ in the cell against their concentration gradient. Thi...
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Answered by Matilde M. • Chemistry tutor
29086 Views

What is the difference between a one-tailed and two-tailed hypothesis?

A one-tailed hypothesis is directional, meaning that you expect your results to turn out a specific way. When constructing a one-tailed hypothesis, you are predicting the effect the independent variable will...
ED
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What is a protein?

A protein is a sequence of many amino acids. All proteins are made of amino acids. Humans have 20 distinguished amino acids that can arrange in thousands of different combinations and this means that they ca...
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Answered by Matilde M. • Biology tutor
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What's the difference between an elastic good and an inelastic good?

An elastic good is a good that has a price elasticity of demand that is greater than one. This means that the demand for the good will change significantly if the price changes. An example of such is coke-a-...
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Answered by Hana K. • Economics tutor
31169 Views

How do I know when to use the imperfect tense when talking about the past?

The imperfect tense is used for actions that: a) occurred repeatedly i.e. I used to do ballet twice a week, when I was younger. b) actions that occurred over a period of time i.e. I used to drink alcohol. Ad...
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Answered by Esther A. • Spanish tutor
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