What is the function of xylem?
a. It conducts water downward in the plant.
b. It transports food upward in the plant.
c. It transports minerals and water throughout the plant.
d. It transports photosynthetic materials from stem to leaf.
e. It slows the evaporation of water from the plant.
ANSWER: c
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Gene regulation during development is _____, which means that _____
A. restrictive; genes are successively lost over time B. restrictive; genes lose developmental potential over time C. hierarchical; genes expressed at each stage control the expression of genes that act later D. hierarchical; genes are turned on in a specific sequence, starting with totipotent and ending with multipotent E. combinatorial; genes expressed at each stage control the expression of genes that act later
Evaluate this statement: Cholesterol is a type of lipid, and thus all cholesterol lipids are bad for human health
A) True, because high levels of cholesterol lead to increased heart disease. B) True, because high levels of cholesterol lead to obesity. C) False, because some types cholesterol increase heart disease, but other types are necessary, especially in the plasma membrane. D) False, because cholesterol levels are not related to human health.
Figure 3.7B
The figure above illustrates a ____ reaction that produces one ____ and a ____.
A. condensation; hydroxyl; polymer B. condensation; water molecule; polymer C. cleavage; water molecule; monomer D. rearrangement; water molecule; polymer E. rearrangement; hydrogen ion; polymer
GM foods are considered safe by advocates who cite ________
A) the lack of reliable data due to relaxed governmental oversight B) 20 years of consumption with no reliable correlation to disease or adverse effects C) the GM food is exactly the same as the non-GM food D) robust toxicity testing that is done in humans shows no adverse effects