Skeletal muscle growth and development is inhibited by ____ produced in muscle cells
a. erythropoietin
b. acetylcholine
c. epidermal growth factor
d. epinephrine
e. myostatin
ANSWER: e
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The colorless rootlike projections of mosses, liverworts, and hornworts, which anchor them to the substrate are called
A. rhizoids. B. tap roots. C. fibrous roots. D. specialized roots. E. storage roots.
Which of the following choices is not a mechanism by which enzymes generally speed reactions?
a. orienting substrates in favorable positions b. helping substrates get together c. permanently donating a proton or electron to the reaction d. inducing a fit between enzyme and substrate
Nervous tissue contains which two types of cells?
A. muscle fibers B. adipocytes C. fibroblasts D. neurons E. neuroglia
Which of the insects in the accompanying figure is a flea?
a. 1
b. 2
c. 3
d. 5
e. 6