Select the best response to the question. ?
?Which of the following patients presenting with diarrhea is at high risk of having ?Clostridium difficile ?colitis?
A) a patient who ate contaminated food
B) a patient taking antibiotics for pneumonia
C) a patient who recently traveled to South America
D) a patient taking high doses of anti-inflammatory medications
B
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Match the reactant in the TCA cycle on the left with the appropriate enzyme on the right.
A) fumarate dehydrogenase B) malatase C) succinyl CoA synthetase D) malate dehydrogenase E) citrate synthase F) fumarate hydratase G) succinate dehydrogenase H) aconitase 1. Oxaloacetate 2. malate 3. citrate 4. fumarate 5. succinyl CoA
A four-chambered heart, hollow limb bones with supporting struts, and a keeled sternum are features associated with
most modern ____.
a. mammals b. snakes c. turtles d. lizards
e. birdsDiploid cells have two copies of each chromosome
1.True 2.False
In Lake Malawi cichlid fishes, one can observe two color variants, Black Barred (BB) and Orange Blotch (OB)
Sex in these fishes are not determined by a sex chromosome, but rather by a gene on an autosome which produces either males or females. Both of these phenotypes are controlled by one biallelic locus each. OB females have a selective advantage in terms of their survivability: The OB phenotype allows females to blend into their background. OB males have a selective disadvantage because their reproductive coloration is dis-rupted and they have little mating success. How would this process influence the as-sociation of alleles at the color locus and sex determining locus? What will be an ideal response?