Which of the following diseases can be prevented by vaccination?
A. typhoid fever
B. salmonellosis
C. cat scratch disease
D. gonorrhea
E. chancroid
Answer: A
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Communities near benthic hydrothermal vents survive in perpetual darkness, where no photosynthesis
is possible. What do the producers of this ecosystem use as an energy source?
What will be an ideal response?The standard state of dilute aqueous solutions is at a temperature of ________°C (298 K), ________ atmosphere(s) of pressure, and with products and reactants present in concentration of ________ mol/L
Fill in the blank with correct word.
In eukaryotes, the nucleus is enclosed by a double membrane called the:
A) cell membrane. B) nuclear envelope. C) nucleolus. D) nucleoplasm. E) nucleosome.
Solar energy is the same thing as heat energy.
Answer the following statement true (T) or false (F)