The nonliving portion of the bone is made mostly of _____
polysaccharides, sodium, and sugars
keratin, sodium, and sebum
collagen fibers, calcium, and phosphates
red bone marrow, yellow bone marrow, and spongy bone
C. collagen fibers, calcium, and phosphates
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The area on the retina that has the greatest density of cone cells is called the ____
a. fovea b. visual ganglion c. lateral geniculate nucleus d. visual cortex e. blind spot
Water surface tension is caused by __________ bonds. Fill in the blank(s) with the appropriate word(s)
Which of the following statements is false?
a. Only B cells and their progeny make antibodies. b. The primary immune response is faster and more complete than a secondary immune response. c. Naive B cells already have antibodies but have not yet encountered an antigen. d. Macrophages will digest invading bacterial cells but do not destroy the antigens that eventually become mounted on their surfaces. e. B cell progeny may differentiate into memory cells.
What is the major disadvantage of an exoskeleton?
A) It hardens only after an extended exposure to air. B) It does not provide effective support for muscles. C) It does not protect the internal organs. D) It must be periodically shed for growth to occur.