Refer to Figure 26-3. At point 4, several Chlamydomonas cells are “packaged” in a surrounding membrane. Which of the following statements concerning those cells is FALSE?
a. They are gametes.
b. They were produced by mitosis.
c. They are part of the negative (?) strain.
d. They are part of the haploid generation.
e. They can also be considered zoospores
E
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Which of the following statements about the loop of Henle is correct?
A. The thick segment of the ascending limb is impermeable to water. B. The descending limb actively transports electrolytes into the interstitial fluid. C. Water moves from the interstitial fluid into the descending limb of the loop of Henle. D. The filtrate is more concentrated when it leaves the loop of Henle than when it enters the loop. E. All of these answer options are correct.
32P-end-labeled DNA fragment contains the AP-1–binding site sequence
The DNA was mixed with Fos, FosC (a fragment of Fos), or Jun (all of which would form a homodimer), or with a mixture of Fos and Jun or a mixture of FosC and Jun (both of which would form the two types of homodimer and the heterodimer). Reactions were analyzed by polyacrylamide gel electrophoresis, thenautoradiography. The results are shown in Figure 1. This technique is called: A. DNA footprinting. B. electrophoretic mobility shift assay. C. reporter gene assay. D. immunoprecipitation.
Which of the following are key elements of detrital food webs?
a. Fungi b. Herbivores c. Carnivores d. Plants
Which is the smallest unit of life that can exist as a
separate entity? a. a cell b. a molecule c. an organ d. a population e. an ecosystem