Compare and contrast passive and active transport mechanisms, and give an example of each
What will be an ideal response?
Passive transport involves the movement of molecules across a membrane along the concentration gradient without ATP. Examples of passive transport include simple diffusion, facilitated diffusion, and osmosis. Diffusion is the net movement of particles from regions of greater to lower concentration until equilibrium is reached. Facilitated diffusion is the movement of a substance from higher to lower concentration with aid from a membrane protein. Osmosis is the diffusion of water across a membrane from areas of higher to lower concentrations. Active transport requires the input of energy (ATP) for the movement of solutes, typically against the concentration gradient.
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To maintain homeostasis freshwater fish must _____
A) excrete large quantities of electrolytes B) consume large quantities of water C) excrete large quantities of water D) take in electrolytes through simple diffusion
The result obtained in Jacob and Monod's merodiploid analysis that suggested the lacO region acts in cis to regulate the lac operon was:
A. a nonfunctional lacI mutant is rescued by a wild-type lacI allele. B. a nonfunctional lacI mutant cannot be rescued by a wild-type lacI allele. C. a nonfunctional lacO mutant is rescued by a wild-type lacO allele. D. a nonfunctional lacO mutant cannot be rescued by a wild-type lacO allele.
Answer the following statements true (T) or false (F)
1. Glucocorticoids (i.e., cortisol, prednisolone, dexamethasone) have a diverse number of functions. They include glucose mobilization during stress, development of lung tissue, and therapies to reduce inflammation. 2. Metamorphosis in flatfishes and in amphibians is controlled by growth hormone. 3. The nervous system integrates with the endocrine system to control hormone secretion. 4. The placenta develops from the endometrium while the fetus develops from embryonic tissue.
After the results of the chromatography and electrophoresis experiments, can you reasonably conclude that the red shell color is produced by a single red pigment whose synthesis is catalyzed by an enzyme (with an approximate mass of 45 kDa) coded for by the dominant allele?
a. Yes b. No c. You can reasonably conclude that the shell color is produced by a singlepigment, but not that it is catalyzed by an enzyme coded for by the dominantallele.