Suppose a new mutation that improves metabolic efficiency is lost from a small population of mammals living in a region of seasonal food scarcity after a hurricane eliminates half the mammal population. This is an example of
A) directional selection.
B) stabilizing selection.
C) disruptive selection.
D) sexual selection.
E) genetic drift.
E
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Prior to secretion, Gram-negative bacterial proteins are translocated across one membrane while Gram-positive proteins are translocated across two membranes.
Answer the following statement true (T) or false (F)
Explain how the resulting phenotypic ratios from Mendel’s dihybrid cross assisted him in framing his Second Law. What will be an ideal response?
Reference is often made to adapter molecules when describing protein synthesis in that they allow amino acids to associate with nucleic acids. To what class of molecules does this term refer?
A) amino acids B) DNA C) protein D) tRNA E) mRNA
Encephalitis caused by arboviruses involves
A. coma, convulsions, and paralysis in severe cases. B. muscle aches and joint stiffness. C. fever, headache, and rash. D. myalgia and orbital pain. E. All of the choices are correct.