A protein called GEF-H1 is known to control immune responses to certain viruses such as influenza A. GEF-H1 is best classified as which kind of protein?

a) a structural protein

b) an antibody

c) an enzyme

d) a messenger protein

What do you call a forest that is going through secondary ecological succession? A. A second-growth forest B. A tree farm C. A tree plantation D. An old-growth forest

3. Which of the following statements explains why atoms are always neutral in charge a. They have the same number of protons as the atoms of all other elements. b. They have protons that are identical to the protons of all other elements. C.

A Bunsen burner is used for heating in a laboratory. Which safety procedure is important to follow when using a Bunsen burner?

What are the three r

Which two molecules bond together to form a disaccharide? A. Carbon dioxide and water B. Two water molecules C. Fructose and glucose D. Nucleic acid and protein

What place are sloths found?

In a solution of salt and water, which component is the solute? a. salt b. water c. beaker d. oxygen c

What are the two types of warm air masses that influence the weather in north america name and explain how they typically affect the weather

Which word describes an artificial pond with raised edges used for agriculture A) shaduf B) paddy C) aqueduct D) Chinampa

Why is dark matter difficult to measure? A) Because it does not exist in our galaxy. B) Because it disappears when it encounters ordinary matter. C) Because it creates so much heat it melts any instruments invented so far.