The organism shown here lives in
a. tropical seas.
b. cool oceans.
c. freshwater lakes and rivers.
d. temperate forests.
e. wetlands.
Answer: b
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You are genetic counselor, and a couple comes to you with concerns that if they have a child together
it could have sickle-cell disease. Genetic tests reveal that the man and woman are both carriers for sickle-cell disease. Which of the following would be a correct thing to tell them?
a. Any child that they produce has a 50% chance of having sickle-cell disease, and the rest will be carriers. b. All of their offspring will have sickle-cell disease. c. They should not have any concerns, as no child that they produce should wind up with sickle-cell disease. d. No child that they produce should wind up with sickle-cell disease, but each of their offspring will have a 50% chance of being a carrier. e. Any child that they produce will have a 25% chance of having sickle-cell disease.
Which hair-like cellular projections line the respiratory tract and sweep inhaled particles away from the lungs?
a. flagella b. cilia c. intermediate filaments d. pseudopods e. microvilli
The first tetrapods evolved
a. on land. b. after the amphibians. c. in water. d. after the first amniotes. e. from the ray-finned fishes.
What do the DNA sequences found at the origins of replication signify?
What will be an ideal response?