Which of the following specifies a single amino acid in a polypeptide chain?

A. the three-base sequence of mRNA

B. the complementarity of DNA and RNA

C. the aminoacyl-tRNA synthetase

D. the base sequence of the tRNA

How do pesticides affect the environment

Salt water is an abundant resource but unusable for irrigation and drinking. As demands on freshwater sources increase, the use of desalination processes to remove salt from ocean water is increasing.

Which phrase best describes the tundra climate? A. cold and wet B. cold, windy, and dry C. warm, windy, and dry D. warm and wet

Question 14 5 pts "Cells with the ""F factor"" can generate a and undergo mating."

What are the major reservoirs of the carbon cycle

A specific molecule was separated from a yeast cell and then placed in a flask to find out if it would bind to another molecule. This type of experimental design is called a (n) A. in vitro observation B. occupational cohort study C.

If one is experiencing difficulty sleeping, like with insomnia, he or she may go to their family doctor. What type of drug is the doctor most likely to prescribe to assist the person in falling asleep?

As you examine a soil sample under your microscope, you note the presence of tiny, worm-like organisms. You immediately suspect that these creatures are nematodes.

A proton gradient across the mitochondrial inner membrane is a requisite for the synthesis of ATP. What contributes to the creation of this proton gradient?

Peter has been seeing a counselor for problems in his sexual life. Peter's counselor referred him to an urologist to treat his problem.