In Noller’s fragment reaction,
a. RNA-met* mimicked the rRNA
b. puromycin was used to mimic tRNA
c. the 50S subunit was used to test the peptidyl transferase reaction
d. digesting proteins eliminated activity
e. digesting rRNA did not eliminate activity
C
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Which of the following are important biotic factors that can affect the structure and organization of biological communities?
A) precipitation, wind B) nutrient availability, soil pH C) predation, competition D) temperature, water E) light intensity, seasonality
The microsporidian Brachiola gambiae parasitizes the mosquito Anopheles gambiae
Adult female mosquitoes must take blood meals for their eggs to develop, and it is while they take blood that they transmit malarial parasites to humans. Male mosquitoes drink flower nectar. If humans are to safely and effectively use Brachiola gambiae as a biological control to reduce human deaths from malaria, then how many of the following statements should be true? 1. Brachiola should kill the mosquitoes before the malarial parasite they carry reaches maturity. 2. The microsporidian should not be harmful to other insects. 3. Microsporidians should infect mosquito larvae, rather than mosquito adults. 4. The subsequent decline in anopheline mosquitoes should not significantly disrupt human food resources or other food webs. 5. Brachiola must be harmful to male mosquitoes, but not to female mosquitoes. A) 2 and 5 B) 1, 2 and 4 C) 1, 2, and 4 D) 2, 3, 5 E) 3 and 4
Trisomy 21 is the only autosomal trisomy that allows survival into adulthood
a. True b. False
A technique used for preparing a slide with colorless bacteria against a colored background is called
a) negative staining. b) Gram staining. c) acid-fast staining. d) endospore staining.