Spherical resting cells produced by Sporocytophaga are called ________.
A. heterocysts
B. oocysts
C. microcysts
D. nitrocysts
Answer: C
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Which of the following is not a known function of RNAi?
A. directing the replacement of amino acids in an existing polypeptide B. protection against invading RNA viruses C. control of transposon activity D. chromatin structure
A scientist fused a mouse cell and a human cell, then treated the cell with specific antibodies
covalently linked to fluorescent dyes (antibodies to mouse proteins--green; antibodies to human proteins--red). What does the cell look like immediately after fusion?
a. The cell is half red and half green. b. The red and green fluorescent labels are uniformly distributed across the entire membrane. c. The red and green labels are distributed in intermingled patches. d. The red and green labels flash intermittently. e. The red and green labels are distributed in a swirling pattern
Vertebrates that practice internal fertilization employ three strategies for embryonic and fetal development. In one strategy, the female retains the young which develop and obtain nourishment from the female's blood. What is this called?
A. oviparity B. ovoviviparity C. viviparity D. protogyny E. protandry
The tropics are known to have greater species diversity than the temperate zones.Which explanation for this phenomenon is the least convincing?
A. Niches are narrower in the tropics. B. Fewer predators in the tropics allow more prey species to flourish. C. Seasonal variability is less in the tropics. D. Greater spatial heterogeneity in the tropics creates more niches. E. The tropics have greater plant production, which supports greater overall species richness.