Protein degradation in eukaryotes is performed by
A. proteasome.
B. ATP synthase.
C. cytoskeleton.
D. flagellum.
E. ribosome.
Answer: A
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Homeotic genes
a. cause lethal mutations. b. regulate development of specific body parts c. are found only in fruit flies, where they are responsible for odd placement of appendages. d. produce “fate maps.” e. form as blocks of genes in cells randomly distributed throughout the body.
Why have plants been implicated in the Ordovician and Devonian glaciations, but not the Proterozoic glaciations?
A. Land plants had not yet evolved during the Proterozoic. B. Proterozoic plants had simple root structures that did not increase rock weathering. C. Proterozoic plants used anoxygenic photosynthesis. D. The nonvascular plants present during the Proterozoic did not contribute to global nutrient cycles.
During which of the following phases of cellular respiration does substrate-level phosphorylation take place?
A) the citric acid cycle B) glycolysis and the citric acid cycle C) "grooming" of pyruvate D) oxidative phosphorylation E) glycolysis
Pseudomonas aeruginosa causes all the following except
A. severe nosocomial infection in burn patients. B. skin rashes from contaminated hot tubs and bath sponges. C. diarrheal illness. D. external ear infection. E. serious infection in lung tissue of cystic fibrosis patients.