Suppose that photosynthetic eukaryotic cells are provided with CO2 synthesized with heavy oxygen (18O). Then suppose that the 18O label will be found in all but one compound. What is that compound?
a. glucose
b. O2 gas
c. cellulose
d. 3-phosphoglycerate
Ans: b. O2 gas
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Why is genetic variation critical for evolution?
A. It is required for mutations. B. It is the source material for natural selection. C. It is the same as increased adaptations. D. It is essential for genetic recombination. E. It is not critical for evolution.
Trace the path of a sound wave beginning from its entry into the ear to its transmission to the brain. What will be an ideal response?
The xylem and phloem are produced by the
A. vascular cambium. B. sieve tube. C. vascular bundle. D. mycorrhizal fungi. E. companion cells.
Answer the following questions true (T) or false (F)
1. When an endospore germinates, it gives rise to two daughter cells called vegetative cells. 2. Various species of Streptomyces are important sources of antibiotics. 3. Halophiles grow equally well in the presence or absence of high salt concentrations.