No other planet in our solar system has oxygen in its atmosphere. The source of oxygen in our atmosphere is
A. heterotrophic metabolism.
B. volcanic eruptions.
C. photosynthesis.
D. lightning discharge.
C. photosynthesis.
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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 cystic fibrosis. Genetic tests reveal that the woman is a carrier for cystic fibrosis but the man is not. Which of the following would be a correct thing to tell them?
a. Any child that they produce has a 50% chance of having cystic fibrosis, and the rest will be carriers. b. All of their offspring will have cystic fibrosis. c. They should not have any concerns, as no child that they produce should wind up with cystic fibrosis. d. No child that they produce should wind up with cystic fibrosis, 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 cystic fibrosis.
Which of the following is NOT true of plant
hormones?
a. they are active in an adult plant body b. they are signaling molecules c. they produce effects only at high concentrations d. they are produced only in certain regions of the plant e. all of these are NOT true of plant hormones
Which of the following is a major function of the ovaries?
A. They manufacture the sex hormones, estrogen and progesterone. B. They comprise the canal through which babies are delivered. C. They are the organs directly responsible for a woman's orgasm. D. They hold and nourish the developing fetus.
Why is the biological membrane said to be selectively permeable?
What will be an ideal response?