Plants transport water to their leaves through the xylem when water evaporates from the leaves. The evaporating water pulls other water molecules up the xylem through ________.
A. hydrogen bonds
B. covalent bonds
C. ionic bonds
D. hydrophobic interactions
Answer: A
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Because of fluctuations in the environment, such as depletion of food supply or an outbreak of disease,
a population may periodically experience a rapid and marked decrease in number of individuals, leading to a form of genetic drift called
a. a founders effect. b. migration. c. gene flow. d. natural selection. e. a genetic bottleneck.
Plasmodesmata are most similar to ____
a. gap junctions in animal cells b. tight junctions in bacteria c. basement membranes in animal cells d. adhering junctions in heart muscle e. both tight junctions in bacteria and adhering junctions in heart muscle
A gemma is a sexual reproductive structure produced by certain liverworts
____________________ Indicate whether the statement is true or false.
How would the endocrine and nervous systems respond to an individual touching a hot stove?
A. sending signals that cause the individual to move his/her whole body away B. sending signals that cause the release of epinephrine C. sending signals that pull the individual's hand away D. sending signals that cause the release of norepinephrine E. the endocrine and nervous systems would cause an individual to do all of these things