What is abnormal muscle tone or tension called?
a. dystonia
b. atrophy
c. dystrophy
Answer: a. dystonia
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How do viability stains usually distinguish between living cells and dead cells?
A) The chemical fluoresces only when bound to ribosomes that are actively synthesizing proteins. B) The chemical stain is taken up by living cells and once metabolized becomes fluorescent. C) The dye specifically targets intact cytoplasmic membranes. D) The dye's fluorescence is quenched by dead cells.
In the eukaryotic promoters that have it, the CAAT box appears to be critical to the promoter's ability to facilitate transcription
Indicate whether the statement is true or false
Evolution acts at the level of the
A. species. B. population. C. ecosystem. D. community.
The data below suggest that the proportion of sexuals in snails increases with parasite load. Is this the only possible explanation for the observed differences in the degree of sexual reproduction?
a. Yes, the data points show a clear correlation between parasite load and sexual reproduction. b. Yes, factors other than parasites are unlikely to fine-tune the degree of sexual reproduction in natural populations. c. No, lakes and streams differ in their average parasite load. d. No, habitat differences between lakes and streams may be responsible for different levels of sexual reproduction.