What was the significance of the Hershey-Chase experiments in which 32P and 35S were used?
a. They finally demonstrated the semiconservative nature of DNA replication.
b. They demonstrated that harmless bacterial cells had become permanently transformed through a change in the bacterial hereditary system.
c. They established that pure DNA extracted from disease-causing bacteria transformed harmless strains into killer strains.
d. They demonstrated that radioactively labeled bacteriophages transfer their DNA but not their protein coats to their host bacteria.
e. They demonstrated that DNA content of a cell does not vary over time.
d
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Movement in bacteria
A. is directly to or away from a stimulus. B. relies on the beating of cilia. C. is often referred to as run and tumble. D. may involve pili. E. is often referred to as run and tumble AND may involve pili.
You are developing an ELISA test to detect cysts of a parasitic protozoan in stool specimens. Select the following items that would be part of this test.
A. Patient specimens B. Enzyme-labeled antibody against the parasite C. Enzyme-labeled rabbit anti-human-IgG antibody D. Chromogenic enzyme substrate E. Microtiter plate containing wells coated with antibody against the parasite
If rotifers have a diploid number of 38, how many chromosomes would be found in a sperm
cell?
a. 38 b. 19 c. 76
Three-year-old Ben's parents are ecstatic because he is now using the potty each time he needs to defecate. What muscle has Ben learned to control?
A. The Sphincter of Oddi made of smooth muscle B. The external anal sphincter made of striated muscle C. The internal anal sphincter made of smooth muscle D. The pyloric sphincter made of smooth muscle E. The cardiac sphincter made of striated muscle