Human pathogens are classified as
A) thermoduric.
B) thermophiles.
C) mesophiles.
D) hyperthermophiles.
E) psychrophiles.
C
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Which is an example of acquisition of natural passive immunity?
A) a fetus protected from disease by its mother's antibodies B) a person who received his or her yearly influenza vaccine C) a person who acquired the chickenpox D) a person who received tetanus antiserum after stepping on a rusty nail
In the years after the completion of the human genome project, genome sequencing revealed surprisingly little amount of variation in the sequence and arrangement of nucleotides in humans
a. True b. False Indicate whether the statement is true or false
Which of the following is NOT true of enzyme
behavior? a. Enzyme shape may change during catalysis. b. The active site of an enzyme orients its substrate molecules, thereby promoting interaction of their reactive parts. c. All enzymes have an active site where substrates are temporarily bound. d. Each enzyme can catalyze a wide variety of different reactions. e. Enzyme activity is affected by pH and temperature.
Why is ultraviolet radiation damaging?
a. Because it consists of wavelengths that are longer than visible light, the energy of the photons of ultraviolet light is greater and more damaging to biological molecules. b. Because it consists of wavelengths that are shorter than visible light, the energy of the photons of ultraviolet light is greater and more damaging to biological molecules. c. Because it consists of wavelengths that are shorter than visible light, the energy of the photons of ultraviolet light is lesser and more damaging to biological molecules. d. Because it consists of wavelengths that are shorter than visible light, the energy of the photons of ultraviolet light is lesser and less damaging to biological molecules.