A cell that lacks sulfite oxidase but can still oxidize sulfur for energy could be identified by
A) adenosine phosphosulfate reductase coupled with substrate-level phosphorylation.
B) electrons being transferred to cytochrome c prior to shuttling them into the electron transport chain.
C) identifying an alternative quinone, flavoprotein, or cytochrome.
D) quantifying the release of sulfate byproduct.
Answer: A
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What is an organism's advantage to having a single reproductive event in a lifetime rather than being able to reproduce repeatedly? a. Reach a higher level of reproductive maturity
b. Having to raise only one group of offspring. c. Being able to invest all its energy into the production of offspring. d. Being able to divide energy among growth, reproduction and maintenance.
The chemical colchicine prevents the formation of microtubules. It is commonly used in certain experimental procedures to cause changes in cellular chromosomes. Which of the following changes is it likely to be used to create?
A) Induction of mutant polyploid individuals B) Induction of mutant aneuploid individuals C) Prevention of nondisjunction in cell cultures D) Induction of chromosomal deletions in experimental cell lines E) Induction of chromosomal duplications in experimental cell lines
At one time the uncoupler 2,4-dinitrophenol was used as a weight reducing drug. Its side-effects, including death, resulted in its discontinued use. How could this drug cause weight loss?
A) The uncoupler allows the oxidation of fats from adipose tissue without the production of ATP. This allows the oxidation to proceed continuously and use up the fats. B) The uncoupler causes ATP to be produced at a much higher rate than normal and this causes weight loss. C) The uncoupler inhibits the transport of pyruvate into the matrix of the mitochondria. Fats are then degraded to glycerol and subsequently to pyruvate to provide the necessary energy, thereby depleting fat stores. D) The uncoupler is an allosteric activator of ATP synthase. This increases the rate of translocation of H+ and the oxidation of fuels, including fats.
Edema (swelling) occurs when ________.
a. collagen fibers enlarge as they change from dehydrated to hydrated shape b. areolar tissue soaks up excess fluid in an inflamed area c. reticular connective tissue invades the area d. adipose cells enlarge by pinocytosis