Why can't plants use N2 directly as a nutrient?
A) The N2 molecule is too large to enter the stomata.
B) Most soils are depleted of N2 as a nutrient.
C) N2 diffuses out of leaves as quickly as it diffuses in, so it has to be "fixed" to remain in leaves.
D) Plants lack the enzymes necessary to convert N2 into NO3?or NH4+.
E) Plants must use NO3? to carry out nitrogen fixation.
D
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When non-homologous chromosomes exchange parts, a _____ has occurred
A. reciprocal translocation. B. mismatch. C. base exclusion. D. inversion. E. closed reading frame.
Why is the amniotic egg considered a key evolutionary innovation?
a. It enables eggs to float in an aquatic medium. b. It greatly increases the survival probabilities of eggs in a terrestrial environment. c. It extends embryonic development. d. It prohibits external fertilization, thereby facilitating the evolutionary innovation of internal fertilization. e. It has a shell with a single membrane.
Adjuvants such as aluminum salts are used as additives in vaccines to enhance immune responses
Indicate whether the statement is true or false
Suppose you have a random sample of 200 students' GMAT scores that have a sample mean of 700 and sample standard deviation of 50, and would like to calculate the 90 percent confidence interval of the population mean. Which of the following would be the correct construction?
A. 700 ± 1.65 
B. 700 ± 1.65 
C. 700 ± 1.96 
D. 700 ± 1.96 