The experiments by Hershey and Chase helped confirm that DNA was the hereditary material on the basis of the finding that:
a. Radioactive phage were found in the pellet
b. Radioactive cells were found in the supernatant
c. Radioactive sulfur was found inside the cell
d. Radioactive phosphorus was found inside the cell
Answer: d. Radioactive phosphorus was found inside the cell
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Wheat is a group of grass species. Cultivation originated in the eastern Mediterranean about 10,000 years ago. In comparison to closely related wild grasses, cultivated wheat has shorter stalks and fewer, larger seeds that are firmly attached to the stalk
(e.g., they don't blow away in the wind). How do these changes affect the evolutionary fitness of wheat? A. Fitness is increased because the dispersal of embryos is reduced. B. Fitness is increased because the dispersal is limited. C. Fitness is decreased because more energy is devoted to trying to grow longer stalks. D. Fitness is decreased because the seeds are not dispersed.
In thylakoids, protons travel through ATP synthase from the thylakoid space to the stroma. Therefore, the catalytic "knobs" of ATP synthase would be located
A) on the side facing the thylakoid space. B) on the ATP molecules themselves. C) on the pigment molecules of photosystem I and photosystem II. D) on the stromal side of the membrane. E) built into the center of the thylakoid stack (granum).
The Centers for Disease Control and Prevention assigns the most virulent microbes known to cause human disease to Biosafety Level 4.
Answer the following statement true (T) or false (F)
Which of the following molecules is not found in plants?
(a) cellulose (b) lignin (c) collagen (d) pectin