Suppose that your roommate is on a 48-hour fast for food and drink. This means that she has no nutrients or liquids entering her system. What would happen to her blood pressure, and why? What hormones would be triggered by the lack of incoming liquids?
Explain how these hormones work and how the fast would affect her blood pressure and urine volume.
What will be an ideal response?
Her blood pressure will decline because of lack of incoming fluids. The lack of water will decrease plasma volume, ultimately lowering blood pressure. This will signal aldosterone and antidiuretic hormone (ADH). Aldosterone will increase sodium reabsorption, which encourages water reabsorption. ADH will directly increase water reabsorption. Collectively, these hormones will send water back to circulation in an attempt to keep blood volume and pressure up. This will decrease urine volume.
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Fly species W, found in a certain part of the island, produces fertile offspring with species Y. Species W does not produce fertile offspring with species X or Z. If no other species can hybridize, then which of the following statements about species W
and Y are true? I) Species W and Y have genomes that are still similar enough for successful meiosis to occur in hybrid flies. II) Species W and Y have more genetic similarity with each other than either did with the other two species. III) Species W and Y may fuse into a single species if their hybrids remain fertile over the course of many generations. A) Only I is correct. B) Only II is correct. C) Only III is correct. D) I, II, and III are correct.
Which process will release or expel large substances out of the cell?
a. Phagocytosis b. Diffusion c. Osmosis d. Endocytosis e. Exocytosis
Cytokinesis, plants vs. animals
What will be an ideal response?
Diphtheria toxin is produced only by strains of Corynebacterium diphtheriae that are infected with a particular bacteriophage. This is an example of ________.
A. lysis B. induction C. lysogenic conversion D. conjugation