While socializing with friends one night, you all decide to list the important traits you prefer in a mate. What evolutionary pressure is at work here?
a. gene flow
b. genetic drift
c. nonrandom mating
d. environmental variance
c. nonrandom mating
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Which statement regarding porphyrin synthesis pathways is CORRECT?
A. The succinyl-CoA/glycine porphyrin pathway is used by all bacteria, photosynthetic eukaryotes, and archaea. B. The porphyrin biosynthetic pathways are unified at the step of 5-aminolevulinic acid. C. The glutamate porphyrin pathway is used by all non-photosynthetic eukaryotes and alpha-proteobacteria. D. There is very little conservation of porphyrin synthesis pathways between eukaryotes, bacteria, and archaea.
In a DNA profile analysis using two loci, the chance of a match between two unrelated individuals at one locus is 1 in 400, and 1 in 1000 at the second locus. Therefore, the overall probability that two unrelated individuals will match at both loci is ____________________
Fill in the blank(s) with correct word
Which of the following groups give rise to a disease similar to that caused by Shigella sp.?
A. enterotoxigenic B. enteroinvasive C. enteropathogenic D. enterohemorrhagic E. All of the choices are correct
In mid-December, a woman with insulin-dependent diabetes who had been on prednisone fell and received an abrasion on the dorsal side of her right hand. She was placed on penicillin. By the end of January, the ulcer had not healed, and she was referred to a plastic surgeon. On January 30, a swab of the wound was cultured at 35°C on blood agar. On the same day, a smear was made for Gram staining
The Gram stain showed large (10 µm) cells. Brownish, waxy colonies grew on the blood agar. Slide cultures set up on February 1 and incubated at 25°C showed septate hyphae and single conidia. The most likely cause of the infection is a A) gram-negative bacterium. B) dimorphic fungus. C) parasitic alga. D) yeast. E) protozoan.