Biologists are concerned about the long-term survival of northern elephant seals because ________
a. the population contains little genetic variability and could be vulnerable to selection pressures
b. elephant seals are still hunted
c. many individuals are emigrating to southern habitats and taking genetic diversity with them
d. killer whales, whose populations are increasing in some areas, prey on elephant seals
a
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In the United States, parathion is the most widely used member of a class of ____.
a. organophosphate herbicides
b. organophosphate insecticides
c. chlorophosphate fungicides
d. chlorophosphate herbicides
e. chlorophosphate insecticides
What is the function of a protein kinase?
A. To phosphorylate GDP to generate GTP B. To remove phosphate groups from proteins C. To cleave membrane phospholipids D. To add phosphate groups onto proteins
If one parent has type A blood and the other parent
has type B, then which of the following is possible in the children? a. only AB b. A and AB c. B and AB d. A, B, AB, and O e. only O
Which of the following generally makes skeletal muscle different from both smooth and cardiac muscle?
A) Skeletal muscles are made of cells called "fibers." B) Skeletal muscle cannot be contracted voluntarily. C) Skeletal muscle can be contracted voluntarily. D) Skeletal muscle cells have nuclei.