An individual with a genetic makeup of aa BB is
called
a. pure-breeding.
b. recessive.
c. hybrid.
d. dihybrid.
e. heterozygous.
Answer: a
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As oxygenated blood enters tissue capillaries, the oxygen ____
a. binds more tightly to hemoglobin b. diffuses from blood plasma into body cells c. diffuses from interstitial fluid into blood plasma d. acts as a substrate for carbonic anhydrase e. reaches equilibrium in blood plasma and interstitial fluid
The Cenozoic era, during which the diversity of animals living today arose, has extended from 65 mya to the present. This is approximately ___ of the geologic timescale.
A. 4% B. 15% C. 1.5% D. None of the answer choices is correct. E. 7%
A sample from an abscess is stained and examined under the microscope. A Gram stain appears uniformly pink, but a GMS (Gomori methenamine silver) stain reveals brownish filaments in the sample. These findings suggest
A) necrotizing fasciitis. B) sporotrichosis. C) leishmaniasis. D) phaeohyphomycosis. E) dermatophytosis.
Which of the following statements about sister chromatids is TRUE?
A. Sister chromatids are produced during mitosis. B. Sister chromatids are exact copies of each other and are formed just prior to cell division. C. Sister chromatids are held together by complementary base pairing of DNA at the centromere. D. After mitosis, sister chromatids contain the same genes, but they may have different alleles. E. All of these statements about sister chromatids are TRUE.