Which of the following statements is
INCORRECT?
a. Enzymes remain unchanged after a
reaction.
b. Like enzymes, many coenzymes remain
unchanged after a reaction.
c. Cofactors are atoms or molecules other than
proteins that interact with enzymes.
d. Coenzymes are organic molecules that
interact with enzymes.
e. Activity of enzymes may also be affected
by the concentration of salt
B
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Which types of eukaryotic cells have cell walls composed of cellulose?
A. Fungi B. Protozoa C. Plants D. Algae E. Both algae and plants
You are shown an example of two organisms in a relationship, in which one lives on the other. The organism living on the other benefits from nutritional resources, while the organism being lived upon is harmed. This is an example of
A. predation. B. mutualism. C. commensalism. D. parasitism. E. intraspecific competition.
Which of the following statements about the cortex is true?
a. It secretes a protective layer of cutin. b. It is at the core of the herbaceous eudicot stem. c. It is filled with cork cells. d. It translocates sugar by means of a pressure gradient. e. It may contain collenchyma and sclerenchyma.
Dietary factors are now being studied for how they regulate gene activity and how this contributes to disease. For example, how does a diet high in unsaturated fatty acids help maintain a healthy blood lipid profile? Within hours of feeding animals with
diets rich in polyunsaturated fatty acids (PUFAs), there is an increase in the activity of genes responsible for making enzymes that break down fats and a reduction of the activity of genes responsible for making enzymes that make fats. This has the effect of changing fat metabolism, which leads to a lowering of blood lipid levels. The control of what type of DNA sequence would PUFAs most likely be affecting? A) exon sequences B) intron sequences C) enhancer sequences D) micro-RNA sequences