Four of the five events listed below lead to secondary
succession. Select the exception.
a. opening the canopy in a tropical rain forest
b. abandoning a cotton field
c. retreat of a glacier in Alaska
d. a forest fire
e. growth of weeds in a lawn that is not mowed
Answer: c
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Gene regulation by siRNA is ____ in eukaryotes and may have evolved originally as a ____
A. rare; way to regulate gene expression B. widespread; way to regulate gene expression C. rare; defense against mutations that may cause cancer D. widespread; defense against viruses E. rare; defense against viruses
All EXCEPT which of the following events shuffles
existing alleles into different combinations in sexually reproducing organisms? a. changes in chromosome number b. mutation c. independent assortment of chromosomes d. crossing over e. fertilization
Which of the following phenotypic ratios would be expected to result from a dihybrid cross?
a. 9:3:1 b. 9:3:3:1 c. 9:3:4 d. 3:1
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