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
Answer: C
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Which of the following has a single strand of DNA shaped like a loop?
a. Plasmids b. Prokaryotes c. Eukaryotes d. Gametes
Molecular data suggests that land plants evolved from
A. rhodophyta. B. charophytes. C. dinoflagellates. D. the water molds. E. ciliates.
This bacterium's ability to survive in a human who is taking penicillin pills may be due to the presence of _____
1. penicillin-resistance genes 2. a secretory system that removes penicillin from the cell 3. a Gram-positive cell wall 4. a Gram-negative cell wall 5. an endospore A) 1 or 5 B) 2 or 3 C) 4 or 5 D) 2, 4, or 5
The function of eukaryotes membranes include
A. cell-to-cell adhesion. B. unselective transportation. C. cell signaling. D. ATP synthesis. E. barriers separating extracellular and intracellular environments.