Genetic differences between populations tend to be reduced by
A) gene flow.
B) mutation.
C) the founder effect.
D) natural selection.
Ans: A) gene flow.
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Early work with Clostridium tetani and Corynebacterium diphtheriae demonstrated
A. the importance of thoroughly cooking food. B. the usefulness of vaccines. C. the potential threat from spore-forming bacteria. D. that disease can be caused by poisonous substances produced by bacteria.
During G2, a cell produces ________
a. daughter cells b. the bipolar spindle c. proteins that drive mitosis d. newly synthesized DNA
What will happen after a gardener cuts off all the developing flowers on a tomato plant, with the exception of 12 of the flowers that have already been pollinated and set fruit?
A) The tomato plant will drop the 12 previously pollinated flowers. B) The tomato plant will become dormant until next year and then 12 tomatoes will ripen. C) The 12 tomatoes will develop fully on the plant, but they will be small and not very sweet. D) The 12 tomatoes will develop, and they will be larger and sweeter than if the other flowers remained.
The first multicellular terrestrial organisms were
A) plants. B) amphibians. C) insects. D) fungi. E) reptiles.