All of the following STDs are bacterial infections EXCEPT
A. AIDS.
B. chlamydia.
C. syphilis.
D. gonorrhea.
Answer: A
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If a mutant organism used mitosis to produce gametes, what would be the result of mating with a wildtype partner?
A. Progeny would be quadraploid, and almost certainly nonviable. B. Progeny would be triploid, and almost certainly nonviable. C. Progeny would be normal -- this is a common occurrence in some phyla. D. The resulting progeny would be identical twins. Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about gametes? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
The "Cambrian explosion" refers to
A. the mass extinction of dinosaurs. B. the origination of all major phyla of animals. C. the development of the first true cell. D. the origination of life. E. the creation of Earth.
Darwin's concept of evolution "the theory of descent with modification through variation and natural selection" can be demonstrated by which of the following examples?
A. A monkey accidentally drops her fruit in the salty water of a bay, she recovers the fruit and eats it. She discovers that the fruit is cleaner and tastes better after it has been in the salty water. She continues to wash fruit in the bay before eating. Her offspring see what she has done and also wash their fruit in the salty water. Soon the whole population is washing their fruit. B. A female alligator gives birth to a male alligator that has the ability to change color to a bright white when it is in cold water. The baby male alligator is quickly spotted by a large bird of prey and eaten. C. Several turtles hatch from a clutch of eggs buried in the sand on a beach. One of the turtles is the color of the sand, the others are darker in color. The turtles all scurry to the water, but one by one the dark turtles are eaten by birds, only the sand colored turtle survives. When it enters the water the sand color changes to a darker brown. The turtle grows, mates and has offspring that are also sand colored when they are born. D. A giraffe stretches his neck to reach higher branches. The exercise of stretching up strengthens the muscles in the neck and legs. This ability to stretch is also seen in the giraffe's offspring.
Please match the statement to the term that it best describes.
Overreaction of the immune system to relatively harmless antigens that results in damage to the host A) Immunodeficiency B) Allergy C) Autoimmunity D) Grafts and transfusions