The hemoglobin molecule ____
a. transports oxygen from the lungs to the cells of the body
b. prevents sickle cell anemia when present in high enough concentrations in the blood
c. is involved in amino acid metabolism
d. acts as a cell surface receptor
e. is controlled by a single gene
a
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At age 19, Ian Waterman suffered a bout of stomach flu and the antibodies produced to fight off the pathogen ended up attacking his nerves in a highly specific way. The nerves that were damaged by his immune system left him with no sense of the location of his bones, limbs, joints, and muscles in space. Though he could continue to feel heat and pain, he had no sense of his body existing in the space below his neck. He became known as “the man who lost his body”. Which somatosensation did Mr. Waterman lose?
a. vestibular sensation b. equilibrium c. proprioception d. gustation
An erection of the penis results most directly from:a
the bone present in the penis. b. dilation of the veins leading from the penis. c. contraction of the muscles within the penis. d. dilation of the arteries in the penis. e. a blocking of enzymes within the penis
Which of the following classes of microbes possess both, DNA and RNA in their structure?
A. Prions B. Viruses/viroids C. Eukaryotes D. Prokaryotes E. Both, eukaryotes and prokaryotes
Negatively charged ions are required to balance the net positive charge from metal ions such as K+, Na+, and Ca2+
Which of the following negatively charged ions is the most abundant outside the cell and which ion does most often neutralize (written in parentheses)? (a) Cl– (Ca2+) (b) PO43– (K+) (c) PO43– (Ca2+) (d) Cl– (Na+)