If during the gram stain procedure, the bacterial cells were viewed immediately after crystal violet was applied, gram positive cells would be purple but gram negative cells would be colorless
a. true
b. false
b. false
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Histone modification:
A. is fixed; once a histone is modified, it stays that way and the genes with which it is associated are turned on or off permanently. B. is fixed, but this has no effect on whether genes are expressed. C. is randomâ€"sometimes the lysines are modified and sometimes they're not, but the state is independent of the environment or cell type. D. can change over time in response to environmental cues, allowing genes to be turned on or off as needed. E. can change over time in response to environmental cues, but this has no effect on gene expression.
Tendrils are
A. structures in some carnivorous plant leaves that trigger the leaves to close on insects. B. starch-storing specialized roots. C. specialized stems that grow across the ground, and reproduce shoots and roots. D. the central, supporting stalk of a compound leaf. E. specialized stems that coil and provide springy attachment for climbing.
After eating a Yummie cake, which of the following metabolic processes is likely occurring at the fastest rate?
A) hydrolysis of glycogen B) dehydration reactions involving glucose C) dehydration reactions involving fatty acids D) hydrolysis of cellulose
The density of Douglas firs in an old-growth forest is estimated by counting the Douglas firs in four sample plots of 1 hectare each. The number of fir trees in the plots is 10, 12, 7, and 11, respectively. What is the estimated density of firs in the
forest? A) 5 trees per hectare B) 10 trees per hectare C) 20 trees per hectare D) 25 trees per hectare