Lake Ontario is home to a species of catfish with green and brown phenotypes, of which the green variant is more abundant, and the brown variant is more susceptible to predation. An angler accidentally releases brown catfish into a nearby pond where only green catfish had previously existed, and the brown catfish quickly supplant the native green catfish population there. The exact reason for the brown catfish’s newfound success is unknown, but it is possible that they are better able to hide from predators in the brown silt and thicker foliage that exists in the pond. What principle would this demonstrate?
a. directional selection
b. absolute fitness
c. relative fitness
d. diversifying selection
c. relative fitness
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When tryptophan levels in a cell are low, a cell will stall transcription but continue translation of the tryptophan operon.
Answer the following statement true (T) or false (F)
Which statement describes a similarity between meiosis and mitosis?
a. Both halve the chromosome number of the parent cell. b. Both produce 4 daughter cells. c. Crossing-over occurs in both. d. Both create genetically different daughter cells. e. DNA is replicated only once in both processes.
What is the difference between Ras and the G proteins bound to G protein coupled receptors (GPCRs)?
A. Ras is a small G protein and the G proteins bound to GPCRs are not small G proteins. B. Ras can activate different effector molecules and the G proteins bound to GPCRs cannot activate different effector molecules. C. Ras is a second messenger and the G proteins bound to GPCRs are not second messengers. D. Ras is an enzyme and the G proteins bound to GPCRs are not enzymes.
The M protein of Streptococcus pyogenes
A) Protects against phagocytosis and enhances adherence. B) Is also called streptokinase. C) Is the basis for the organism belonging to Lancefield Group A. D) Protects against lysozyme damage. E) Gives rise to a zone of beta hemolysis on blood agar.