The Gram stain is used for bacteria that have cell walls while the acid-fast stain is used primarily for wall-less bacteria.
Answer the following statement true (T) or false (F)
False
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The polymerase used in PCR reactions is derived from the thermophile organism Thermus aquaticus
Indicate whether the statement is true or false
In order to elucidate the Calvin cycle, Calvin and his colleagues used two-dimensional paper chromatography to
analyze the presence of different molecules under different conditions. What did they conclude from the accumulation of RuBP when CO2 levels were low?
a. RuBP only reacts with CO2 in the sunlight. b. RuBP only reacts with CO2 when concentrations of ATP are low.
c. RuBP is the first substrate to react with CO2. d. RuBP is the last substrate to react in the Calvin cycle. e. CO2 serves as a non-competitive inhibitor of rubisco.
The most abundant mineralocorticoid is
a. epinephrine. b. norepinephrine. c. aldosterone. d. cortisol. e. estrogen.
Figure 7.6 from your text, shown below, is a set of histograms showing the frequency of different color patterns of water snakes of Lake Erie (Nerodia sipedon)
Type A snakes are unbanded, Type B are strongly banded, and Types C and D are intermediates. Given that natural selection favors unbanded snakes on the islands, how can you account for the presence/perpetuation of banded snakes on the islands? A) Mutation rates converting unbanded alleles to a banded form operate at high frequencies on islands. B) Natural selection favors unbanded snakes on the mainland. C) Snakes on the islands represent a case of the so-called founder effect. D) Natural selection favors banded snakes on the mainland, which occasionally migrate to the islands.