Certain mutations in the regulator gene of the lac system in E. coli result in maximal synthesis of the lac proteins (?-galactosidase, etc.) even in the absence of the inducer (lactose). Provide an explanation for this observation
What will be an ideal response?
There has been a mutation in the gene that produces the repressor so that it can't bind to the operator (a mutation in the repressor that prevents lactose binding would have the opposite effect), or the operator is mutated so that it will not interact with the repressor.
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Cotton-topped tamarins are small primates with tufts of long white hair on their heads. While studying these creatures, you notice that males with longer hair get more opportunities to mate and father more offspring. To test the hypothesis that having longer hair is adaptive in these males, you should _____.
A) test whether other traits in these males are also adaptive B) look for evidence of hair in ancestors of tamarins C) determine if hair length is heritable D) test whether males with shaved heads are still able to mate
Sex-linked genes are ____
a. found on autosomes b. only found on the Y chromosome c. only inherited from the mother d. involved in sex determination and can be found on any chromosome e. found on the X and Y chromosomes
Which species is considered to be the most ancient?
a. Homo erectus b. Australopithecus afarensis c. Australopithecus sediba d. Homo sapiens e. Sahelanthropus tchadensis
The pH of the stomach is extremely acidic (~ pH 2). If you ate a Yummie cake, what do you think would happen to the protein that you ingested as it passes through the stomach?
A) The protein would become denatured due to the acidic environment. B) The protein would form longer proteins via dehydration reactions. C) The protein would speed up digestion because it is an enzyme. D) The protein would get broken down via dehydration reactions.