If the competition coefficient ? is positive, that likely means
A) that the two species are strong competitors.
B) that the two species are predator and prey.
C) that the species are mutualistic.
D) that only one of the species will survive.
C
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Scientists have proposed a number of mechanisms by which the xylem carries water to the tops of the highest trees. Which of the proposed mechanisms is the correct one?
a. capillary action b. guttation c. transpiration d. root pressure e. xylem pumps
Outline the four characteristics of cancer. What will be an ideal response?
Which of the following demonstrates negative feedback by the endocrine system?
(A) During labor, the fetus exerts pressure on the uterine wall, inducing the production of oxytocin, which stimulates uterine wall contraction. The contractions cause the fetus to further push on the wall, increasing the production of oxytocin. (B) After a meal, blood glucose levels become elevated, stimulating beta cells of the pancreas to release insulin into the blood. Excess glucose is then converted to glycogen in the liver, reducing blood glucose levels. (C) At high elevation, atmospheric oxygen is more scarce. In response to signals that oxygen is low, the brain decreases an individual's rate of respiration to compensate for the difference. (D) A transcription factor binds to the regulatory region of a gene, blocking the binding of another transcription factor required for expression.
Which of the following represents a difference between viruses and viroids?
A) Viruses infect many types of cells, whereas viroids infect only prokaryotic cells. B) Viruses have capsids composed of protein, whereas viroids have no capsids. C) Viruses have genomes composed of RNA, whereas viroids have genomes composed of DNA. D) Viruses cannot pass through plasmodesmata, whereas viroids can.