Tetanus is a very serious disease caused by a toxin from a bacterium. Which of the following is the most obvious symptom?
A) excessive sneezing
B) dissolving bones
C) excessive weight gain
D) muscle paralysis
D
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Movement of spirochetes occurs by means of structures called
A. cilia. B. flagella. C. endoflagella. D. pili.
What is the appropriate order of the stages of investigating whether maple trees drop their leaves in the autumn because of colder days?
(1) Maple trees are grown in two greenhouses where the only variable is temperature (15?C vs. 10?C). (2) The hypothesis is rejected. (3) There is no statistical difference in the number of leaves dropped at 10?C as compared to 15?C. (4) The observation is that maple trees drop their leaves in autumn. (5) The hypothesis is that maple trees drop their leaves because of colder temperatures. A. 1, 2, 3, 4, 5. B. 3, 4, 5, 1, 2. C. 5, 4, 3, 1, 2. D. 4, 5, 1, 3, 2. E. 3, 4, 2, 1, 5.
How does a prokaryotic cell differ from a eukaryotic cell?
a. A prokaryotic cell has no membrane-enclosed organelles. b. A prokaryotic cell has a plasma membrane. c. A prokaryotic cell contains organelles. d. A prokaryotic cell has a nucleus. e. A prokaryotic cell has DNA.
True/False: If you graph the response of a drug versus its concentration, a safe drug would have a large space between the curves for the toxic dose and the effective dose of the drug.
What will be an ideal response?