What were the main symptoms of pellagra

Many enzymes require metal ions as cofactors due to the inherent properties of the metal ion. Metal ions, when bound to water, will favor the formation of hydroxide ion, which is a strong nucleophile.

Which of the following is an example of an insect that laps up food?

Turgor pressure is the result of: A) the activity of the contractile vacuole. B) water accumulation within a cell. C) the rigidity of the plasma membrane. D) All of these choices are correct.

I need an example of a machine that represents Photosynthesis, and another that represents Cellular Respiration. Any suggestions?

Why does the trait for shortness seem to "skip a generation"?

How does the structure of fats enable them to hold so much energy?

Why are fungi unable to live in dry areas? A. They have filaments with small surface areas. B. They cannot trap moisture. C. They have no reproductive structures. D. They are angiosperms.

How does growing beans in a ziplock bag is faster than in a cup with soil?

If blood is in short supply, which blood type would be the most beneficial to have on hand if someone needed a blood transfusion? 1. O+ 2. O- 3. AB+ 4. AB -

Describe how a person can count the rate if beating of the left ventricle.