Corneal implants have been implicated in a few cases of
A.
botulism.
B. trypanosomiasis.
C. Creutzfeldt-Jakob.
D. scrapie.
C.
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A cross is done between parents with genotypes aaBbCc and aaBbcc. What is the probability that
offspring will have the same phenotype as the first parent? Assume that capital letters indicate dominant alleles and lower case letters indicate recessive alleles.
a. 1/8 b. 1/4 c. 3/8 d. 3/16 e. 9/16
Depolarization of the neuron plasma membrane occurs due to
a. the diffusion of K+ into the cell. b. the diffusion of K+ out of the cell. c. the diffusion of Na+ into the cell. d. the diffusion of Na+ out of the cell. e. closed gated channels.
A mechanism shared by both extracellular and intracellular digestion is
A. a slow speed of digestion. B. the ability to phagocytose food particles. C. the ability to consume both large and small food items. D. the presence of a digestive cavity.
Which of the following organisms would you most likely expect to find preserved as a fossil?
a. a jellyfish b. a shelled arthropod such as a trilobite c. an earthworm d. a nematode e. a protozoan