The pH scale is based on the hydrogen ion (H+) concentration of pure water, which has a pH of 7. What is the net difference in hydrogen ion (H+) concentration between pH 7 and pH 8?
a. 1 x 10-8
b. 10 x 10
c. 1 x 10
d. 1 x 8-10 moles
c. 1 x 10
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DNA is wrapped around histones, which contain many copies of the positive amino acids lysine and arginine. These positive amino acids neutralize the negative charge of the ______________ of the DNA wrapped around the histone
A. ribose sugar B. hydroxyl group C. nitrogenous base D. phosphate group E. All of the answer options are correct.
The graph below shows a growth curve of E. coli growing in a defined medium containing equal molar amounts of glucose and lactose.
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Based on your knowledge of the regulation of the lac operon, the best explanation of these results is that
A) early on, due to the presence of lactose, the bacteria utilize the lac operon. Glucose is used later.
B) the bacteria are utilizing both sugars simultaneously.
C) the presence of glucose causes the formation of cAMP catabolic repressor protein (CRP) complexes, which shut down the lac operon until the glucose is used up.
D) glucose is used first. Once glucose becomes limiting, intracellular cAMP increases, forming cAMP-CRP complexes that activate the lac operon to use lactose.
E) none of the above
Protists are alike in that all are
A) multicellular. B) photosynthetic. C) marine. D) nonparasitic. E) Eukaryotic
How would the shape of a DNA molecule change if adenine paired with guanine and cytosine paired with thymine?
A) The DNA molecule would be longer. B) The DNA molecule would be shorter. C) The DNA molecule would be circular. D) The DNA molecule would have irregular widths along its length.