When a human oocyte ovulates, it arrests in metaphase II until it is fertilized by a sperm. How many chromosomes are present in the oocyte at metaphase II?
a)46
b)2 with sister chromatids still attached
c)4
d)23 with sister chromatids still attached
d)1
d)23 with sister chromatids still attached
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Hepatitis B infection
A. increases risk for hepatocellular cancer. B. is due to a flavivirus. C. has an incubation of 1 to 3 weeks. D. can be transmitted by the fecal-oral route. E. All of the choices are correct.
What could be a possible consequence if a structural gene's TATA box is mutated?
A. The transcriptional start site may not function properly. B. Transcription may start at a variety of sites. C. Unusable transcripts may be produced. D. The preinitiation complex may form at the wrong site. E. All of the choices are correct.
What is the function of microvilli?
a. Microvilli provide structure inside the cell to maintain its shape and support organelles. b. Microvilli allow cells to remain attached to neighboring cells in hostile environments. c. Microvilli provide cells with a larger surface area for absorbing nutrients from food. d. Microvilli provide a means of rudimentary locomotion for cells that distribute nutrients.
Within eukaryotic cells, energy is derived from the breaking down of glucose. What is this process called?
A) dehydration synthesis B) photosynthesis C) cellular respiration D) transformation