Select the examples that can undergo microevolution.
A. A poison ivy vine growing up an oak tree.
B. A cluster of endangered Venus Flytraps in North Carolina's Green Swamp.
C. A large herd of caribou in Alaska.
D. A small group of Cactus finches living in the Galapagos Islands.
E. An Emperor penguin encountering melting ice due to climate change.
Answer: D
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A doctor discovers that her patient can produce antibodies against some bacterial pathogens, but he is unable to protect himself against viral infections. The doctor suspects a disorder in her patient's
A. B cells. B. plasma cells. C. cytotoxic T cells. D. suppressor T cells. E. macrophages.
Sieve elements differentiate through a process called ____ that causes the destruction of certain cell structures
a. adsorption b. rotting c. ecdysis
d. autolysis e. translocation
You are given two samples of DNA, one from Clostridium perfringens and the other from Mycobacterium tuberculosis. Unfortunately, the labels on the tubes of DNA were accidentally removed, and you do not know which DNA sample belongs to which organism
As you were doing some work with Escherichia coli in the lab, you also have some of its DNA available as well. The %G + %C values for each of the organisms is known (C. perfringens, 27%; M. tuberculosis, 67%; E. coli, 50%). Based upon this information, how could you quickly determine the source of the DNA for your two samples? What will be an ideal response?
The Ames test ________.
A. is used to measure levels of oxygen-free radicals B. can be used to measure the mutagenicity of chemicals C. is used to measure the repair of thymine dimers D. None of the choices are correct.