You extract DNA from an E. coli cell and observe it is hemi-methylated. Which strand of DNA is older?
A. The methylated strand
B. The strand that is not methylated
C. Neither—they are the same "age."
A
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How is immune memory beneficial to a host organism?
What will be an ideal response?
Select the correct meaning for the following pedigree symbol.
A) Unaffected male
B) Unaffected female
C) Mating
D) Affected male
E) Affected female
________ muscle is the type of muscle primarily responsible for stomach contractions.
A. cardiac B. smooth C. skeletal
HIV is inactivated in the laboratory after a few minutes of sitting at room temperature, but the flu virus is still active after sitting for several hours. What are the practical consequences of these findings?
A) HIV can be transmitted more easily from person to person than the flu virus B) The flu virus can be transmitted more easily from person to person than HIV C) This property of HIV makes it more likely to be a pandemic than the flu virus D) Disinfecting surfaces is more important to reduce the spread of HIV than the flu