Which of the following creates pluripotent stem cells without the need to destroy an embryo?
A) retrieval of stem cells from umbilical cord blood
B) induced pluripotent stem cells
C) retrieval of stem cells from adult bone marrow
D) embryonic stem cell removal from unused embryos at fertility clinics
Answer: B
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Which level of taxonomy encompasses all of the others?
a. family b. class c. order d. species e. genus
The human heart ____
a. contracts as a result of electrical stimuli from the sinoatrial node b. contracts only as a result of nerve stimulation from the central nervous system c. is activated primarily through the autonomic nervous system d. contracts as a result of electrical stimuli from the atrioventricular node e. is independent of all nervous control
In order for cellular respiration to occur in a cell, oxygen must be present.
a. true b. false
Frameshift mutations result from:a
the substitution of one base pair for another. b. the substitution of more than one base pair. c. the insertion or deletion of one or two base pairs. d. the substitution of a stop codon for an amino acid-specifying codon. e. the substitution of a start codon for an amino acid codon.