Plant cells permit ions and small molecules to move between adjacent cells by means of cytoplasmic
channels in their cell walls. These channels are called
a. gap junctions.
b. plasmodesmata.
c. desmosomes.
d. cell junctions.
e. tonoplasts.
B
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This hemorrhagic fever causes disease in humans and nonhuman primates such as chimpanzees, gorillas, and monkeys. It is identified in the laboratory using which type of assay?
a. Immunodiffusion b. Peptide nucleic acid fluorescence in situ hybridization (PNA-FISH) c. Transcription-mediated amplification (TMA) d. Reverse-transcriptase polymerase chain reaction (PCR)
The organ of Corti ____
a. is integral to balance b. controls the sense of depth perception c. has hair cells that fire and sends signals to the brain d. is involved in visual acuity e. detects light energy
The scientist who elucidated the three-dimensional structure of hemoglobin is:
A) Max Perutz B) Linus Pauling C) Frederick Sanger D) Robert Corey E) John Kendrew
All individuals of a species express the same degree of plasticity.
a. true b. false