How many amino acids are important in the production of proteins in a living body?

(1) 20

(2) 30

(3) 40

(4) 50

Which factor is a population-limiting, density-dependent factor? select one: a. the rapid spread of tuberculosis in heavily populated areas b. a drought that limits food availability c. a heavy flood that destroys a large area around a river d.

Which two organelle are found in plant cells but not in animals cells

Jorge has made the hypothesis that the more he feeds a mouse, the shinier its fur will be, because the mouse will be healthier. What should be the dependent variable in an experiment testing this hypothesis? A. how shiny each mouse's fur is B.

10. What is the matter required by all organisms to live?

How many times are you going to do PMAT in meiosis? Three times Twice Once

Which conclusion about the meaning of Y is correct if the allele combination Yy is for yellow seeds? a. yellow and dominant b. green and recessive c. yellow and recessive d. green and dominant

What is true about web based email? A. it can never be used in evidence B. it is downloaded to the hard drive of a computer C. it is sometimes a stored on the computer like other web pages D. none of the above

Crude oil is composed of: a. Fatty acids c. Metal oxides b. Hydrocarbons d. Halogens

What might introduction of exotic species disrupt an ecosystem

Will aluminum gain or lose electron and why?