Which is not a component of nucleic acids?
A. organic nitrogenous base
B. pentose sugar
C. phosphate
D. sulfur
D. sulfur
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Although there are fewer than 14,000 living species of seedless vascular plants, they were the
dominant plants on Earth for nearly 200 million years. Their dominance ended at the end of the Carboniferous period, about
a. 1.5 billion years ago. b. 420 million years ago. c. 250 million years ago. d. 125 million years ago. e. 17 million years ago.
Which of the following statements about steroid hormones in insects and humans is most accurate?
a. An insect hormone injected into a human would have no effect. b. A human hormone injected in an insect would have no effect. c. The reaction pathways stimulated by steroid hormones in insects and humans are similar. d. The reaction pathways stimulated by steroid hormones in insects and humans are different. e. Insects do not have steroid hormones.
What does the cell wall do when a plant cell is placed in a hypotonic solution?
a. It prevents diffusion. b. It prevents plasmolysis. c. It prevents the cell from bursting. d. It prevents active transport.
You've been asked to stabilize a compound whose general state is altered by excess electrons. The element you would add to the compound to most effectively stabilize the compound would be? Why?
A. oxygen, because it can easily bind with the compound B. carbon, because it is capable of neutralizing electrons C. nitrogen, because it have five electrons on its outer shell D. fluorine, because it is has seven electrons in its outer shell