Naegleria fowleri is a free-living ________ that causes infection by ________
A) amoeba / entering through the nose and burrowing into the brain
B) fungus / entering the lungs when contaminated soil is disturbed
C) flagellated protist / crossing the intestinal mucosa into the blood
D) protist / entering the vagina in women, the prostate and seminal vesicles of men, or the urethra of both males and females
Answer: A
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You grow two trays of Arabidopsis plants under identical conditions, except that one tray of plants is exposed to a gentle breeze for several hours each day
Compared to plants grown in calm conditions what would you expect to see in the wind-exposed plants? I. changes in the expression of many genes II. taller flower stalks III. shorter flower stalks IV. more flexible cell walls V. no changes in 2nd messengers VI. increases in 2nd messengers and/or phosphorylated proteins VII. increased levels of Pfr VIII. stiffer cell walls. A) I, III, VI, VIII B) II, IV, V, VII C) III, IV, VII D) VI, VII, VIII E) wind has no effect on plant development
After ejaculation sperm can live for up to ________
a. 106 hours b. 12 hours c. 48 hours d. 72 hours e. 24 hours
List and discuss five structures in bacteria that allow them to cause disease
What will be an ideal response?
In controlled experiments, researchers study a(n) ____________________ variable and compare the results to those of
the control group. Fill in the blank(s) with the appropriate word(s).