Lichens are a symbiotic relationship between which of the following?
a) a fungus and a liverwort
b) a fungus and a moss
c) two species of algae
d) a fungus and algae
e) two species of fungi
Answer: d) a fungus and algae
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When damaged or single-stranded DNA activates the RecA protein, the RecA protein stimulates the cleavage of LexA. This results in
A) repression of polymerase V and activation of endonuclease. B) activation of the Hfr system. C) derepression of the SOS system. D) increased transduction and recombination.
A person has a mutation in the gene for DNA uracil glycosylase. What is the most likely result of this mutation?
A. an increase in mutations B. the inability to produce mRNA that has uracil in it C. the inability to produce mRNA that has cytosine in it D. Nothing. This enzyme is only involved in silent mutations. E. None of the answer options is correct.
Explain negative feedback control using thyroid hormones as an example
What will be an ideal response?
Wilting is counteracted by
a. turgor pressure. b. osmotic pressure. c. concentration gradients. d. diffusion. e. metabolic pressure within a cell.