If an atom has a charge of +1, which of the following must be true?
A) It has two more protons than neutrons.
B) It has the same number of protons as electrons.
C) It has one more electron than it does protons.
D) It has one more proton than it does electrons.
D
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One of the buffers that contribute to pH stability in human blood is carbonic acid (H2CO3). Carbonic acid is a weak acid that, when placed in an aqueous solution, dissociates into a bicarbonate ion (HCO3-) and a hydrogen ion (H+), as noted below
If the pH of blood increases, one would expect _____. A) a decrease in the concentration of H2CO3 and an increase in the concentration of HCO3- B) an increase in the concentration of H2CO3 and a decrease in the concentration of HCO3- C) a decrease in the concentration of HCO3- and an increase in the concentration of H+ D) an increase in the concentration of HCO3- and a decrease in the concentration of OH- E) a decrease in the concentration of HCO3- and an increase in the concentration of H2CO3 and H+
Thermostable proteins tend to have additional features that improve thermostability. Which of the following is NOT one of these features?
A) increased ionic interactions on the protein surfaces B) highly hydrophilic cores C) decreased tendency of the protein to unfold D) highly hydrophobic cores
Which of the following is the highest (or most complex) level of structure for genetic material?
A. nucleotide. B. double helix. C. DNA. D. gene. E. chromosome.
The envelope of enveloped viruses
A. does not contain spikes. B. is identical to the host plasma membrane. C. is only composed of host endomembrane. D. makes the virus very susceptible to drug therapy. E. is obtained by viral budding or exocytosis.