A digestive tube is best defined as ________
A) the compartment in which an animal digests its food
B) a tube-shaped digestive compartment with either one or two openings
C) a tube-shaped digestive compartment that has two openings and through which food moves in one direction
D) a digestive compartment that conducts both chemical and mechanical digestion
C
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Which of the following is a gastropod?
(a) clam. (b) snail. (c) squid. (d) octopus.
Polygenic characteristics are better studied using genomics instead of individual studies. What is a polygenic characteristic?
a. characteristics involving two or more species’ DNA b. characteristics that are only controlled or expressed based on environmental factors c. characteristics that involve two or more genes and may involve environmental factors as well d. characteristics that follow purely Mendelian inheritance patterns
Which of the following is considered a keystone species within Yellowstone National Park?
a. beavers b. wolves c. elk d. cottonwood
Auxin concentration gradients
a. appear once germination begins. b. promote the transcription of an enzyme that breaks down cytokinin. c. allow formation of plant parts in expected patterns. d. help young cells elongate so that shoots and roots lengthen. e. are described by all of these EXCEPT "appear once germination begins."