An increase in p53 activity frequently occurs in response to
A. stimulation by growth factors.
B. heat shock.
C. a lack of sufficient nutrients.
D. DNA damage.
Ans: D. DNA damage.
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Answer the following statements true (T) or false (F)
1. Valley fever is another name for cryptococcosis. 2. The yeast form of Histoplasma capsulatum is quite distinctive because of its large capsule. 3. Both histoplasmosis and cryptococcosis may be acquired by inhalation of dried bat droppings (guano). 4. Molds in the genus Mucor are commonly referred to as bread molds. 5. If a patient is infected with a dimorphic fungus, it is likely that fungal hyphae would be seen in the infected tissues.
Sometimes an allele that has no phenotypic effect can spread through a population by means of
a. a selective sweep b. genetic recombination c. disruptive selection d. frequency-dependent selection e. directional selection
Sieve tubes are different from vessel members in that they:
a. carry water, not food b. are not connected to each other c. are alive d. do not require companion cells e. have pits in their walls
If a new anesthetic were developed that entered the nerve cells efficiently, why would it be important for the substance to be lipophilic (to dissolve in lipids)?
What will be an ideal response?