You are out at night and hear a sound in the bushes. The electrical signal carrying this information to your brain is carried first by a
A. sensory neuron.
B. motor neuron.
C. interneuron.
D. glial cell.
E. All of these choices are correct.
A. sensory neuron.
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Until the discovery of ________, enzymes were the only recognized biological molecules that were catalytic.
Fill in the blank(s) with the appropriate word(s).
Which of the following statements about the botulism toxin is NOT true?
a. It is an exotoxin. b. It is produced by the bacterium Clostridium. c. It may be found as a contaminant in poorly prepared food. d. Its brand name is Botox. e. It causes muscles to contract.
The number of different proteins a cell can produce is often much larger than the number of genes in
that cell. Indicate whether the statement is true or false.
Which of the following abnormalities is most likely to be lethal to a cell?
a. X chromosome monosomy b. Y chromosome disomy c. X chromosome trisomy d. autosomal trisomy e. autosomal monosomy