In which of the following organisms would one expect to find flame cells?
a. grasshoppers
b. rabbits
c. planaria
d. sea anemone
c. planaria
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The primary cells of the immune response are the T and B cells. T and B cells are types of:
A. natural killer cells B. antigens C. phagocytes D. lymphocytes
Which of the following extend as a bundle from the base to the tip of a flagellum or cilium?
a. microfilaments b. intermediate filaments c. actins d. microtubules
The most abundant protein in mammals is collagen. This strong, ropelike molecule is particularly abundant in which tissue?
A. ligaments B. skeletal muscle C. spinal cord D. heart muscle
What is the fundamental difference between covalent and ionic bonding?
A) In a covalent bond, the partners share a pair of electrons; in an ionic bond, one partner accepts electrons from the other. B) In covalent bonding, both partners end up with filled outer electron shells; in ionic bonding, one partner does and the other does not. C) Covalent bonding involves only the outermost electron shell; ionic bonding also involves the next electron shell inside the outermost shell. D) Covalent bonds form between atoms of the same element; ionic bonds form between atoms of different elements.