Which of the following is true regarding anabolic steroids?
A. Anabolic steroids were first developed by pharmaceutical companies in the late 1800s for the treatment of diseases associated with muscle wasting.
B. Anabolic steroids are developed from estrogen, the female sex hormone.
C. Because the use of anabolic steroids is illegal without a prescription, the purchase of these compounds has decreased over the past twenty years.
D. Anabolic steroids have been found to cause few side effects and do not pose a serious health risk.
E. Anabolic steroids increase muscle mass and are thought to help improve athletic performance.
Answer: E. Anabolic steroids increase muscle mass and are thought to help improve athletic performance.
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Many eukaryotes have a DNA glycosylase that specifically removes T residues from DNA when paired with G. Why is it better to repair the G-T pairing to G-C by removing the T than to remove the G and form an A-T pair?
A. G-C pairs can form three hydrogen bonds between them and are therefore stronger. B. Oxidative damage to guanine by alkylation is the most common reason for G-T pairs, so removal of the T will maintain the original G-C pair. C. T bases easily tautomerize into C bases, so removing the T will make sure the pair stays in its original form. D. G-C basepairs occur more frequently in cells. E. All of the choices provided are potential reasons.
Which of the following organisms utilizes polycistronic mRNAs?
A) E. coli B) C. elegans C) mammals D) choices A and B only E) all of the above
Which of the following would have the most difficulty entering a water lattice?
a. table salt (NaCl) b. a nonpolar molecule c. a sodium ion d. a proton (H+) e. an electron
In regards to altruism, what way are humans like vampire bats?
A. Their altruism is based on haplodiploidy. B. They are both Chiroptera. C. Their altruism is based on kin selection. D. They engage in reciprocal altruism. Clarify question: What is the key concept addressed by the question? What type of thinking is required? Gather Content: What do you already know about altruism? What other information is related to the question? Choose Answer: Given what you now know, what information is most likely to produce the correct answer? Reflection on Process: Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?