A single, quick contraction of skeletal muscle is called a:
a. simple twitch
b. tetanus.
c. pulse contraction.
d. red fiber contraction.
e. white fiber contraction
a
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When Mendel crossed yellow-seeded and green-seeded pea plants, all the offspring were yellow seeded. When he took these F1 yellow-seeded plants and crossed them to green-seeded plants, what genotypic ratio was expected?
A) 1:2:1 B) 3:1 C) 9:3:3:1 D) 1:1 E) 1:1:1:1
An excess number of chromosomes in a gamete results from
A. mutation. B. nondisjunction. C. crossing-over. D. fertilization.
The reduction of pollutants in the environment by microorganisms is called biodegradation
Indicate whether the statement is true or false
In Drosophila, germ cells develop from pole nuclei isolated from the rest of the embryo at the posterior end. How are they "protected" from the effects of posterior concentrations of zygote-produced mRNAs and proteins?
A) Their genes have unresponsive promoters. B) The cytoplasm at the pole is separated by a compartmentalizing membrane. C) The pair-rule, gap, and segmentation genes are not expressed in these cells. D) Homeotic genes in these cells are inhibited by zygotic genes from the mother. E) Paternal effects operate on the embryo only in the pole cells.