Which of the following factors is believed to limit the size of most bacterial cells?
A. the ability to acquire oxygen for cell respiration
B. the availability of carbon in the environment
C. the availability of nitrogen in the environment
D. the fact that nutrients must enter the cells by simple diffusion
Answer: D. the fact that nutrients must enter the cells by simple diffusion
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In Griffith's experiment _____.
a. heat-killed S strain bacteria killed the mice b. R strain bacteria killed the mice c. a mixture of heat-killed S strain bacteria and R strain bacteria failed to kill the mice d. S strain bacteria killed the mice
It is likely that a hospitalized patient with a high lymphocyte count has some type of infection
Indicate whether the statement is true or false
Which of the following best describes the flow of information in cells?
a. Ribosomes make proteins by randomly linking amino acids together. b. DNA acts as a messenger. It binds to a ribosome and provides instructions for making protein. c. DNA is converted to RNA, which is then converted to protein. d. mRNA is made by copying specific regions of DNA called genes. Ribosomes use mRNA as instructions, which provide a code specifying the order of amino acids in a protein.
Which scientist showed that anthrax was caused by the bacterium Bacillus anthracis?
A) Joseph Lister B) Antonie van Leeuwenhoek C) Ignaz Semmelweis D) Robert Koch E) Louis Pasteur