Which of the following acts as an emulsifier?
a. lipase
b. amylase
c. bile
d. trypsin
Answer: c. bile
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The significance of Fred Griffith's experiment in which he used two strains of Streptococcus pneumoniae is that
a. the semiconservative nature of DNA replication was finally demonstrated. b. it demonstrated that harmless bacterial cells had become permanently transformed through a change in the bacterial hereditary system. c. it confirmed that each cell of a given species contains the same amount of DNA. d. it demonstrated that radioactively labeled bacteriophages transfer their DNA but not their protein coats to their host bacteria. e. it demonstrated that mice can change the hereditary content of bacteria.
A molecule comprised of a five-carbon sugar, a nitrogen-containing base, and a phosphate group is called:
a. a nucleic acid. b. a triglyceride. c. deoxyribonucleic acid. d. a polypeptide. e. a carbohydrate.
Some bacteria exhibit a primitive form of behavior in that they can sense the properties of their environments and use that ability to make adaptive responses. Which of the following are NOT capabilities of any known bacterium?
A. respond to light with the aid of flotation devices B. respond to other individual bacteria and transmit DNA via conjugation C. move to other bacteria and aggregate with them in response to chemical signals D. orientation with respect to the Earth's magnetic field E. none of the other options presented