B cells can generate antibodies with over 1010 different antigen-binding sites. How do so many different antibodies fit onto a single B cell?
A. B cells are unusually large cells.
B. B cells have wavy, invaginated plasma membranes to provide more surface area.
C. B cells have long flagella-like extensions to provide more surface area.
D. They don't -- each B cell makes only a single variety of antibody.
D. They don't -- each B cell makes only a single variety of antibody.
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Wheat is a group of grass species. Cultivation originated in the eastern Mediterranean about 10,000 years ago. In comparison to closely related wild grasses, cultivated wheat has shorter stalks and fewer, larger seeds that are firmly attached to the stalk
(e.g., they don't blow away in the wind). How do these changes affect the evolutionary fitness of wheat? A. Fitness is increased because the dispersal of embryos is reduced. B. Fitness is increased because the dispersal is limited. C. Fitness is decreased because more energy is devoted to trying to grow longer stalks. D. Fitness is decreased because the seeds are not dispersed.
The first stage of carbohydrate metabolism is usually the oxidation of glucose to pyruvic acid known as
A) glycolysis B) cell-lysis C) anabolism D) deamination
What is meant by the counterflow of fluid through the limbs of the loop of Henle, and what is its role in the normal
function of a human kidney? What will be an ideal response?
The portion of a plant that lies beneath the ground is the ________.
Fill in the blank(s) with the appropriate word(s).