The ____ in the diagram above is a tertiary consumer.
A. spider
B. frog
C. fish
D. human
B. frog
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Which of the following bacteria does NOT belong with the others?
A) Halobacterium B) Halococcus C) Methanobacterium D) Staphylococcus E) Sulfolobus
Bacterial plasmids and artificial chromosomes are used as ________ to insert foreign DNA into host cells and create recombinant genomes.
A. subunits B. endonucleases C. vectors D. clones
Oxygen will diffuse across gill membranes into
the blood because
a. oxygen is in higher concentration in the blood compared to the water. b. oxygen is in lower concentration in the water compared to the blood. c. oxygen is in higher concentration in the water than in the blood. d. oxygen is in equal concentration in both the blood and the water. e. of none of these
Which subatomic particles contribute to the atomic mass for any given element?
(a) protons (b) protons and neutrons (c) neutrons (d) protons and electrons