A viroid is a(n)
A) complete, infectious virus particle.
B) infectious piece of RNA without a capsid.
C) capsid without nucleic acid.
D) provirus.
E) infectious protein.
B
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In an experiment involving planar bilayers, a solution of table salt (sodium and chloride ions in water) is added on the left side of the membrane while pure water is added on the right side. After 30 minutes the researchers
test for the presence of ions on each side of the membrane. The right side tests negative for ions. What can you conclude? A) The experiment failed. B) The water somehow blocked the movement of ions across the membrane. C) The left side would probably also test negative for ions. D) Ions cannot cross planar bilayers.
The ________ rate refers to the total number of individuals infected at any one time regardless of when the disease began.
A. morbidity B. mortality C. index D. prevalence
Myoglobin is a protein found in the muscles of cetaceans that:
a. stores energy. b. stores oxygen. c. maintains buoyancy. d. maintains heat. e. stores ATP.
Red blood cells transport both oxygen and carbon dioxide molecules.
a. true b. false