____ in the skin protects us from harmful ultraviolet light energy
a. Keratin
b. Collagen
c. Elastin
d. Myosin
e. Melanin
ANSWER: e
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The causative agent of Lyme disease is ________, which is carried primarily by the ________
A) a flavivirus / Ixodes sp. (deer tick) B) Yersinia pestis / Xenopsylla cheopis (rat flea) C) Rickettsia prowazekii / Culex species (mosquito) D) Borrelia burgdorferi / Ixodes sp. (deer tick)
How could you distinguish between a root hair versus a very small root?
A. Root hairs are white, while roots are brown. B. Root hairs are extensions of single cells, while roots are multicellular. C. Root hairs only absorb water, not nutrients like roots. D. Root hairs do not have a cuticle. E. The epidermis of a root hair is thinner than the epidermis of a root.
Male gonads are __________, which produce sperm
and the sex hormone __________. Fill in the blank(s) with the appropriate word(s).
The Human Genome Project accomplishes all of the following except:
a. sequencing the entire human genome. b. identifying all of the genes in the human genome. c. the foundation for studying gene function in humans. d. basis for studying variations in gene sequences related to illness. e. imprinting a gene with the phenotype of the parent