Bacterial cell walls contain ________, which makes them different from other organisms
A) peptidoglycan
B) pectin
C) starch
D) chitin
E) cellulose
A
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Memory cells that form during a primary immune response circulate in the blood for
a. several days. b. weeks. c. months. d. many years. e. a few minutes.
Which division of the nervous system is divided into two opposing systems that control smooth muscles and glands?
a. autonomic b. somatic c. afferent d. central nervous system e. voluntary nervous system
If a region of DNA contained numerous mismatches due to a modifying agent that caused methylation of guanine, which of the following mutagens is most likely the cause?
A. Ionizing energy such as gamma radiation B. A DNA modifier such as an alkylating agent C. A deaminating base such as nitrous oxide D. An intercalating agent such as acridine orange
Four of the following are key characteristics for the survival of a species. Which one is the exception?
A. Ability to acquire energy and nutrients B. Response to environmental change C. Reproduction D. Inability to change E. Ability to grow and adapt through changes in DNA