A snail in your garden and an oyster are quite different in appearance. What would be evidence to justify grouping them together?
A. Both use a radula for feeding.
B. Both use siphons to obtain oxygen.
C. Both have sensory antenna.
D. Both have a mantle capable of secreting calcium carbonate.
Answer: D
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Which statement best describes active transport?
A. A substance goes from an area of high concentration to an area of low concentration, and this releases energy. B. A substance goes from an area of low concentration to an area of high concentration, and this releases energy. C. A substance goes from an area of high concentration to an area of low concentration, and this requires energy. D. A substance goes from an area of low concentration to an area of high concentration, and this requires energy.
Which of the following bacteria is known to cause the formation of peptic ulcers?
a. Helicobacter pylori b. Staphylococcus aureus c. Streptococcus pyogenes d. Escherichia coli e. Micrococcus luteus
The "fight-flight" response is enhanced by secretions
a. from the adrenal cortex. b. known as epinephrine and norepinephrine. c. stored in the pancreas. d. from the kidneys. e. known as acetylcholine.
Suppose a new species of bacterium is discovered. It contains a form of DNA pol III that can add new nucleotides to either the 5' end or the 3' end of an existing strand. All other properties of the enzyme remain unchanged. How would DNA replication in these bacteria differ from normal replication?
A. DNA gyrase would no longer be required for replication. B. Both new strands could be synthesized continuously like the leading strand. C. The same polymerase molecule could synthesize both strands at the same time. D. Helicase would no longer be required for replication.