The cells that surround stomata are:

a. endodermal cells
b. guard cells
c. mesophyll cells
d. vascular bundle cells
e. vessel cells


b

Biology & Microbiology

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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.

Biology & Microbiology

Fetal hemoglobin functions adequately in the fetus but is ineffective in adults. Indicate whether the statement is true or false

Biology & Microbiology

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)

Biology & Microbiology

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?

Biology & Microbiology