Which is true of the Clostridium botulinum toxin?
A. It is heat-sensitive.
B. It is a neurotoxin.
C. It blocks nerve to muscle signal transmission.
D. It is a two-part toxin.
E. All of the choices are correct.
E.
You might also like to view...
Gnetophytes are of great interest to plant biologists because they have many traits more typical of angiosperms, such as:
A. living xylem cells. B. wind pollination. C. double fertilization. D. few, slow-growing leaves. E. cones.
In the Hardy-Weinberg equation, the term q2 refers to the frequency of
a. a recessive allele of a given locus. b. the frequency of a homozygous recessive genotype at a given locus. c. the frequency of all recessive alleles in a population. d. the frequency of a heterozygous genotype at a given locus. e. the frequency of a homozygous dominant genotype at a given locus.
Which of the following statements about cyclin B is false?
a. It is a component of MPF. b. It accumulates throughout S and G2. c. It activates Cdc2 protein kinase. d. It cycles between active and inactive states in the cell cycle.
During your annual physical, a nurse takes your blood pressure by wrapping a sphygmomanometer cuff around your upper arm, which modulates the flow of blood through your brachial artery. The nurse then enters a reading of 115/70 in your medical chart. These numbers mean that the
A. pressure in your brachial artery during ventricular contraction is 115, while the pressure during ventricular relaxation is 70. B. nurse heard sounds through the stethoscope only when the pressure in your brachial artery was exactly 115 and again when it was exactly 70. C. diastolic pressure is 115 and the systolic pressure is 70. D. pressure in the ventricles of the heart is 115 when the ventricles are contracting and 70 when the ventricles are relaxing. E. pressure in your brachial artery during ventricular contraction is 115 while the pressure during atrial contraction is 70.