Upon fertilization, the egg and sperm fuse to form a single cell called a(n) ________
A) zygote
B) gamete
C) embryo
D) gonad
A
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Organic molecules have a carbon backbone and _____ such as -OH and -NH2 that affect their chemical properties.
A. chemical groups B. R groups C. extension groups D. functional groups
Pseudonocardia is an organism that is hosted by
A. ants that cultivate fungal gardens. B. wood-eating insects. C. people with severe acne. D. marine invertebrates.
The enzyme associated with the influenza virus that hydrolyzes the protective mucous coating of the respiratory tract is ________.
A. hyaluronidase B. kinase C. catalase D. reverse transcriptase E. neuraminidase
The time in the history of Earth when evolution was progressing at the most rapid rate, as evidenced
by fossils such as those of the Burgess Shale, is the:a. Cambrian period. b. Ordovician period. c. Silurian period. d. Devonian period. e. Carboniferous period