In which of the following taxa does the mature sporophyte depend completely on the gametophyte for nutrition?
A) fern
B) bryophyte
C) horsetail (Equisetum)
D) A and C
E) A, B, and C
Ans: B) bryophyte
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The following question(s) relate to the data table below, showing typical fluctuating pH and dissolved oxygen levels in a fish pond with a heavy concentration of algae over a 24-hour period.TimeOxygen (ppm)pH2 a.m.4.57.74 a.m.2.87.26 a.m.2.26.88 a.m.2.56.810 a.m.3.97.2Noon6.57.72 p.m.10.08.34 p.m.12.18.86 p.m.13.19.28 p.m.13.09.210 p.m.12.08.8Midnight10.88.3What is a possible reason for oxygen to be so low by the end of the night?
A. Fish consume oxygen during the night, and oxygen starts to run out by dawn; algae are not linked to the low oxygen. B. Algae produce oxygen as a by-product of photosynthesis during the day, but not at night, so oxygen runs out by the end of the night; in addition, fish continue to consume oxygen during the night, which further reduces the oxygen by the end of the night. C. Algae produce oxygen as a by-product of photosynthesis during the day, and not at night, so oxygen runs out by the end of the night; fish are not linked to the low oxygen. D. Neither fish nor algae or linked to the low oxygen found at the end of the night.
In experiments designed as those of Hershey and Chase (1952), 35S was added to a virus replicating within its bacterial host. The new virions were carefully isolated and used to infect fresh bacterial cells in the absence of any radioisotopes. Where would you expect to find the 35S radioisotope?
A) in the phage ghosts B) in the bacterial matrix proteins C) in the bacterial DNA D) in the nucleic acid of the new virions E) in the protein coat of the new virions
The ____ cells produce pepsinogen in the stomach
a. brush border cells b. chief cells c. choanocytes d. parietal cells e. villi
In positional cloning, the researcher begins with a phenotype. To move toward identification of its DNA sequence, she must begin with what step?
What will be an ideal response?