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.
B
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To truly begin to understand nature, we must study and understand:
A. molecules. B. cells. C. organisms. D. ecosystems. E. The study of nature requires an integrated approach that considers molecules, cells, organisms, and ecosystems.
Your alarm clock goes off once again, and it is 7 a.m. Which of the following events leads you to hit
the snooze button?
a. The number of alpha waves emitted by the brain increases. b. The number of theta waves emitted by the brain increases. c. The reticular formation sends stimuli to the cerebral cortex. d. The cortex of the cerebellum is stimulated. e. The limbic system is stimulated.
Plants are considered to be ____
a. heterotrophs b. chemotrophs c. carbotrophs d. autotrophs e. thermotrophs
Red-green color blindness is inherited as a sex-linked recessive trait. The gene is found on the X chromosome. Can a man with normal color vision father a daughter who is red-green color-blind?
A) Yes, if the woman with whom he mates is red-green color-blind. B) Yes, if the man is heterozygous for red-green color blindness. C) No, he can't (unless there is a mutation). D) No, the expression of the trait skips a generation.