All of the following are polysaccharides EXCEPT
A) glucose. B) starch. C) chitin. D) glycogen.
A
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Nicotine from cigarette smoke acts as a ligand and associates with specific proteins on the surface cells in the brain, causing feelings of pleasure and well-being. Below are the events that happen in the cellular response to nicotine
Place the events in the correct order to describe the five basic steps in the pathway of a signal transduction system. A. receptor binding B. receptor activation C. signal transduction D. response E. termination The opening of an ion channel as a result of nicotine association is an example of _________________. ________________ occurs when an influx of ions causes an action potential, which carries the signal to the reward areas of the brain. Nicotine interaction with the transmembrane protein that normally binds the neurotransmitter acetylcholine is an example of _________________. ________________ occurs when the signal causes release of dopamine in the brain, which causes relaxation and feelings of well-being. Rapid elimination of nicotine from the body is an example of ____________. What will be an ideal response?
Ultimately, for aerobic organisms, where does
the energy in ATP come from?
a. glucose b. pyruvate c. water d. NADPH e. sunlight
Drosophila melanogaster, the fruit fly, has a 2n chromosome number of 8. Assume that you are microscopically examining the mitotic and meiotic cells of this organism
You note that in the female, two chromosomal pairs are metacentric and two pairs are acrocentric. (a) Draw the chromosomal configurations as you would expect to see them at the stages listed: mitotic metaphase first polar body (metaphase) primary oocyte (metaphase) ootid (G1) secondary oocyte (metaphase) (b) Given that the previously mentioned cells are from individuals heterozygous for two independently segregating, autosomal loci, plum eyes and curled wings, place appropriate symbols (of your designation) on chromosomes in the drawings you made for part (a). Assume no crossing over, and there may be more than one correct answer in some cases. (c) Assuming that a somatic G2 nucleus from the individuals mentioned above contains about 8.0 picograms of DNA, how much nuclear DNA would you expect in each of the cells mentioned in part (a)?
Which of the following is characteristic of prokaryotic genomes but not eukaryotic genomes?
A) histones B) circular chromosomes C) linear chromosomes D) enclosed in a nuclear membrane E) typically consist of a few to several chromosomes