What is the function of nucleosomes?
a. To prevent DNA strands from tangling.
b. To help DNA replicate.
c. To make RNA synthesis possible.
d. To prevent RNA from tangling with DNA during transcription.
e. To prevent histones from tangling
A
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Which of the following statements about a root cap is false?
a. It protects the delicate root apical meristem b. It secretes lubricating polysaccharides c. It orients the root that it grows downward d. It loses cells during root growth. e. It absorbs nutrients
You look outside and realize that your grass needs to be mowed. You pick up the container of gasoline and see that you have approximately a third of a gallon left. You hypothesize that this amount will be enough to mow your entire lawn. Unfortunately, half way through mowing your lawn you run out of gasoline. You grumble and think to yourself that the next time you mow the lawn, you hypothesize that you will need to have at least two-thirds of a gallon of gasoline available. How did the results of your lawn-mowing experience influence the validity of your new hypothesis for future gasoline needs?
A. Your hypothesis was supported by trial and error. One more trial added to your data set. B. The hypothesis was invalidated by your experimental evidence. C. Your prediction of future gas needs is based on experimental data and therefore increases the validity of your hypothesis. D. Your prediction proved that your hypothesis is correct.
Alexander Fleming kept finding mold contamination that was killing his bacterial cultures. This observation eventually lead to the development of the antibiotic penicillin. Why would a fungus produce a compound that is selectively toxic to bacteria?
A. Killing bacteria is an accident. B. Fungi are killed by bacterial toxins. C. Fungi compete with bacteria for resources. D. Fungi eat bacteria.
Which neurotransmitter is blocked by caffeine?
-Adenosine -GABA -Melatonin -Dopamine