The dark middle layer of the eye that prevents the
scattering of light is the
a. fovea.
b. retina.
c. sclera.
d. choroid.
e. cornea.
Answer: d
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Which statement is true of all protists?
a. They exhibit true multicellularity. b. They are encased in silica-based shells. c. They contain complex organelles and nuclei. d. They live in large colonies of identical protists.
Genes that are exchanged between prokaryotes
are contained in
a. pili. b. plasmids. c. prokaryote RNA. d. the nucleus. e. capsules
The discovery of which of the following
allowed researchers to determine the sequences of nucleotides in DNA molecules?
a. single-nucleotide polymorphisms b. restriction enzymes c. DNA assembly enzymes d. fragment length polymorphisms e. receptor proteins
The collarbone is the
a. tibia. b. patella. c. scapula. d. clavicle. e. tarsal.