A gene may consist of thousands of nucleotides.
a. true
b. false
Ans: a. true
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The process of evolution ultimately depends on changes that occur in the ________ of organisms
Fill in the blank(s) with correct word
What is the name of the biotechnology instrument used to make multiple copies of a DNA sample?
a) polymerase chain reaction b) gel electrophoresis c) light microscopy d)electron microscopy d) all of the above
Forests along rivers in the Pacific Northwest that have lost their salmon populations are less productive because the
A) pollution that killed the fish has also directly affected the trees. B) global warming that wiped out the fish has also harmed the trees. C) dams that prevented the fish from migrating also flooded the forests. D) nitrogen the fish brought from the ocean and contained in their tissues has been lost. E) fishers who overharvested the salmon compacted the soil in the process.
Hermaphrodites are animals that
A) possess both male and female reproductive systems. B) have the gonads of one sex but the external appearance of the other. C) develop from unfertilized eggs. D) must fertilize themselves.