Which of the following is not a feature commonly observed in ? helices?
(a) left-handedness
(b) one helical turn every 3.6 amino acids
(c) cylindrical shape
(d) amino acid side chains that point outward
(a)
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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 prediction proved that your hypothesis is correct. B. Your hypothesis was supported by trial and error. One more trial added to your data set. C. The hypothesis was invalidated by your experimental evidence. D. Your prediction of future gas needs is based on experimental data and therefore increases the validity of your hypothesis.
In some mammals, what is the by-product of digestion that is produced in the stomach, and in which animals may it be produced in large quantities?
a. methane, in carnivores b. methane, in ruminants c. mucus, in ruminants d. mucus, in carnivores
Which of the following cell types conducts water most rapidly through a plant?
A. Parenchyma cells B. Sclerenchyma cells C. Sieve tubes D. Phloem E. Vessel members
What is the name of the process by which one cell divides its material into two smaller cells?
a. interkinesis. b. reduction division. c. synapsis. d. cytokinesis. e. karyokinesis.