Which of the following statements is not true concerning rod and cone cells?
A. Both have pigment molecules embedded in the membrane of the outer segment.
B. Both have synaptic vesicles at the synaptic endings of the inner segment.
C. Both contain retinal, a derivative of vitamin A.
D. Both contain a deep purple pigment called rhodopsin.
E. Both have an outer segment jointed to an inner segment by a short stalk.
Answer: D
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S. pyogenes associated with invasive disease characteristically have
A. leukocidins. B. coagulase. C. streptococcal pyrogenic exotoxin A. D. streptococcal pyrogenic exotoxin B. E. streptococcal pyrogenic exotoxins A AND B.
If a person has a genetic mutation which renders them incapable of making chemoreceptors, which sense would be affected?
A. vision B. taste C. pain D. touch E. hearing
In the female, __________ stimulates follicle maturation
a. GnRH b. LH c. FSH d. estrogen e. progesterone
Eukaryotic and prokaryotic organisms differ in how they process genetic information. Which statements best explain one of these differences?
A. In prokaryotes, genes are transcribed directly into polypeptides. In eukaryotes, genes are transcribed into RNA which is used to assemble polypeptides. B. In prokaryotes, translation occurs before genes are transcribed into mRNA. In eukaryotes, genes are transcribed into mRNA which is then translated into polypeptides. C. In prokaryotes, translation of the mRNA begins before transcription is complete. In eukaryotes, transcription and modification of the mRNA is completed before translation begins. D. In prokaryotes, introns are removed before genes are transcribed into mRNA. In eukaryotes, introns are removed after genes are transcribed into mRNA.