The last step of aerobic respiration is referred to as which of the following?
a. the Calvin Cycle
b. the Krebs Cycle
c. oxidative phosphorylation
d. the citric acid cycle
c. oxidative phosphorylation
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At night, the stomata of most plants will ________
a. regulate the diffusion of nitrogen b. open c. close d. close to prevent the loss of oxygen from the leaf e. regulate the diffusion of carbon dioxide
In phloem, organic compounds flow through _____
a. collenchyma cells c. vessels b. sieve tubes d. tracheids
A codon is ________.
A. the section of RNA that codes for a protein B. the section of DNA that codes for a protein C. three nucleotides of DNA that code for an amino acid D. three nucleotides of RNA that code for an amino acid
The primary effect of lactobacilli in the adult vagina is to
A. maintain an acidic environment B. keep the menstrual cycle regular C. maintain an alkaline environment D. produce a protective mucus layer E. increase fertility