Explain why vegetarians and vegans might be deficient in some amino acids. What will be an ideal response?
ANSWER: To make all the proteins our bodies need, we must have a supply of all 20 amino acids. Some
of these can be made by the cells in our body, but others must be included in our diet; these
are called essential amino acids. A balanced diet is necessary to ensure that we have an
adequate supply of all the essential amino acids. Vegetarians must be especially careful in
planning meals because some plants contain low levels of certain essential amino acids.
Vegetarians and vegans (who consume no animal or dairy products) must select
complementary protein sources to ensure that their diet contains all the essential amino acids.
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The universal regulatory mechanism in eukaryotes for controlling gene expression includes
A. control of the processing of mRNA after it is transcribed from DNA but before it leaves the nucleus, and control of the rate it leaves the nucleus. B. control of the genes transcribed and the rate they are transcribed. C. control of mRNA in the cytoplasm after it leaves the nucleus, including changes to mRNA before translation begins. D. control of polypeptides after they have been synthesized but before they are functional. E. All of these mechanisms are used; there is no single universal mechanism.
3 types of structural classifications
What will be an ideal response?
What are the four most abundant elements found in living systems?
a. nitrogen, carbon, sulfur, and oxygen b. hydrogen, oxygen, nitrogen, and carbon c. magnesium, calcium, iron, and zinc d. hydrogen, oxygen, calcium, and nitrogen e. hydrogen, oxygen, nitrogen, and carbon dioxide
In the reaction, 6CO2 + 6H2O ?C6H12O6 + 6O2, carbon dioxide is being
A. phosphorylated. B. hydrolyzed. C. reduced. D. oxidized. E. condensed.