Water is an optimal respiratory medium because ____
a. water holds less O2 than air
b. O2 concentration in water is affected by solute concentration
c. the density of water allows maximal ventilation over the respiratory surface
d. O2 concentration in water increases at higher temperatures
e. water keeps the respiratory surface wetted
ANSWER: e
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Given the damage caused by UV radiation, the kind of gene affected in those with XP is one whose product is involved with _____
A) mending of double-strand breaks in the DNA backbone B) breakage of cross-strand covalent bonds C) the ability to excise single-strand damage and replace it D) the removal of double-strand damaged areas E) causing affected skin cells to undergo apoptosis
In females with incontinentia pigmenti, the mosaic
effect of X inactivation in human females can be observed in a. skin color. b. hair color. c. distribution of fat cells. d. distribution of sweat glands. e. all of these.
There are potential risks in performing recombinant DNA research on humans and plants
Indicate whether the statement is true or false
Most of the skin's resident flora is found in the uppermost, superficial layers of the epidermis.
Answer the following statement true (T) or false (F)