Which of these are major causes of diarrhea?
A) infection of the lower intestinal tract
B) infection of the upper intestinal tract
C) hormonal stimulation
D) nervous stimulation
Ans:
A) infection of the lower intestinal tract
D) nervous stimulation
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Sediments that are formed from seawater as a result of a variety of chemical processes are called:
a. cosmogenous. b. hydrogenous. c. organic.. d. biogenous. e. terrigenous.
Identify the correct interaction of neurons in
the vertebrate nervous system.
a. stimulus, sensory neurons, interneurons, motor neurons, effectors b. effectors, sensory neurons, interneurons, motor neurons, stimulus c. sensory neurons, stimulus, interneurons, motor neurons, effectors d. motor neurons, interneurons, stimulus, sensory neurons, effectors e. none of these
Which statement about chemical or electrical synapses is true?
a. Electrical synapses require a neurotransmitter. b. In electrical synapses, presynaptic and postsynaptic neurons are separated by synaptic clefts. c. Electrical synapses store excess ions in synaptic vesicles. d. In chemical synapses, presynaptic and postsynaptic neurons are connected by a protein channel. e. Electrical synapses involve the transfer of ions from presynaptic to postsynaptic neurons
How might a single base substitution in the sequence of a gene affect the amino acid sequence of a protein encoded by the gene, and why?
A) Only a single amino acid could change, because the reading frame is unaffected. B) The amino acid sequence would be substantially altered, because the reading frame would change with a single base substitution. C) All amino acids following the substitution would be affected, because the reading frame would be shifted. D) It is not possible for a single base substitution to affect protein structure, because each codon is three bases long.