Why are most cells small?
a. Because they don't produce enough energy to grow larger.
b. Because the body has limited space.
c. Because the surface-to-volume ratio must be adhered to for proper cell function.
d. Because there aren't enough electrolytes to support large cells.
e. Because large cells would not be able to undergo mitosis.
C
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Which of the following are mechanisms to prevent polyspermy?
_____ altering composition of exterior egg coat _____ change in membrane potential of egg _____ cortical granule enzymes remove sperm receptors from egg _____ special proteins inside the egg compare the DNA of different sperm, choosing the most adapted one _____ toxic molecules exit the egg to attack extra sperm _____ vitelline envelopes lift off surface of egg
The (epithelial/goblet/mucous) cells in the tracheal mucous membrane produce mucus.
Fill in the blank(s) with the appropriate word(s).
Organismal body heat is a:
a. byproduct of endergonic reactions. b. product of glucose synthesis. c. byproduct of exergonic reactions. d. product of anabolism. e. product of ATP synthesis.
Which of the antibody classes is able to cross epithelial cells and is therefore present in breast milk?
A) IgM only B) IgA only C) IgG only D) both IgG and IgM E) both IgM and IgA