Which ion is actively transported to regulate pollen growth and fertilization?
a. hydrogen
b. potassium
c. sodium
d. calcium
e. magnesium
ANSWER: d
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Inbred lines of animals, such as laboratory mice, are useful for studying complex traits because:
A. individuals are genetically identical, so differences in traits must be due to environmental differences. B. although individuals differ both genetically and environmentally, the genetic differences are known, so differences in traits can be understood. C. animals are kept in identical environments, so any differences in traits are due to differences in their genes. D. both genetic and environmental differences between individuals are known, making differences in their traits easy to understand. E. None of these choices is correct.
The characteristic ____________of a radioisotope
allows us to determine the age of rocks and fossils using a technique called __________ Fill in the blank(s) with the appropriate word(s).
The limb deformities caused by the tranquilizer ____________________ helped focus attention on the
issue of teratogens. Fill in the blank(s) with the appropriate word(s).
The leaf arrangement illustrated in Figure 34-1 is:
a. pinnate.
b. alternate.
c. compound.
d. whorled.
e. parallel.