The cells that surround stomata are:
a. endodermal cells
b. guard cells
c. mesophyll cells
d. vascular bundle cells
e. vessel cells
b
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Sigma (?) factors can regulate the initiation of transcription. Which of the following is not an example of ? regulation?
A) Some ? factors recognize promoters for genes whose products are necessary when the organism is under stress, such as heat shock. B) Some ? factors recognize genes necessary for nitrogen utilization. C) Bacteriophages may code for specific ? factors that bind the core RNA polymerase and result in recognition of viral promoters. D) There are many ? sigma factors associated with eukaryotic organisms.
Fetal hemoglobin functions adequately in the fetus but is ineffective in adults. Indicate whether the statement is true or false
Which of the following is a normally correct base pairing in transcription?
A. (DNA)A...U(mRNA) B. (mRNA)C...G(tRNA) C. (DNA)U...A(mRNA) D. (DNA)A...T(tRNA)
In early 2014, West African countries began diagnosing and reporting cases of Ebola for the first time in their history. This is an example of a(n) (endemic/epidemic/sporadic) disease
What will be an ideal response?