Some RNA molecules have been discovered that can

A) form primitive cells.
B) duplicate lipid molecules.
C) act as enzymes.
D) convert organic molecules to protocells.
E) degrade proteins.


C

Biology & Microbiology

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What is the main benefit that a plant receives from a mycorrhizal association?

a. removal of excess carbohydrates b. enhanced water uptake c. enhanced flow of carbohydrates to the roots d. enhanced mineral ion uptake

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. coli strains toxic to humans live in the intestine of ____ without sickening them

I. birds and frogs II. goats and sheep III. cattle and deer

a. I only b. I and II c. II and III d. I and III e. I, II, III

Biology & Microbiology

Suppose 64% of a remote mountain village can taste phenylthiocarbamide (PTC) and must, therefore, have at least one copy of the dominant PTC taster allele

If this population conforms to Hardy-Weinberg expectations for this gene, what percentage of the population must be heterozygous for this trait? A) 16% B) 32% C) 40% D) 48%

Biology & Microbiology

The prevention of infection caused by microorganisms is called

A. antisepsis. B. sanitization. C. sterilization. D. disinfection.

Biology & Microbiology