Actual exchange of gases in the lungs occurs in the
a. bronchi.
b. alveoli.
c. bronchioles.
d. tracheas.
e. glottis.
B
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Which number represents the atomic weight of oxygen?
A. 18 B. 16 C. 6 D. Not enough information given
Which of the following is true regarding conjugation?
A. The bacteria must be in physical contact B. Most bacterial species have the ability to conjugate C. Strains called donor strains can transfer genetic information D. Donor strains can convert non-donor strains into donor strains E. All of the answers are correct
Ribosomes can catalyze formation of peptide bonds. This supports the hypothesis that _____
a. an RNA world preceded DNA-based genomes b. RNA can hold more information than DNA c. the first protists had RNA as their genetic material d. RNA's only role is that of an enzyme e. protocells contained DNA
Vaccinations involve exposure to an antigen to elicit __________.
What will be an ideal response?