Artificial RNA with a known base sequence was added to a medium containing bacterial ribosomes and a mixture of amino acids. By chemical identification of the resulting polypeptide, researchers could discover the:

In the respiration-photosynthesis cycle shown above, what are the products of cellular respiration that belong in box 2?

In which part of the body is a ball-and-socket joint found?

Viruses can be transmitted through air, water, food, insect bites, and direct skin contact. once a virus gains entry into the body, it invades a host cell in order to? a. synthesize antibodies for defense b. deactivate the host cell's defenses c. access cell processes for reproduction d. metabolize host proteins and grow