Why don't ants that protect the Acacia tree scare off bees trying to pollinate the tree's flowers?
A. They can't climb to the tops of the tree.
B. The bees are too big.
C. The bees fly in and out quickly.
D. The open flowers contain a chemical that is an ant deterrent.
E. Parasitoid wasps protect the bees from attack.
D. The open flowers contain a chemical that is an ant deterrent.
The flowers of the acacia tree produce a chemical compound that repels the ants. This allows bees to pollinate the flowers without being harmed by the ants.
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Recall the Bartel lab group experiment to create a ribozyme from scratch. If they had created exact copies of each ribozyme (rather than creating copies with a few differences), the ribozymes would have _____
A) become more efficient with each round of selection B) stayed the same with each round of selection C) become less efficient with each round of selection D) stopped catalyzing reactions after just a few rounds of selection
Ionizing radiation alters DNA by
A) deleting bases. B) removing nitrogen from the bases. C) breaking the sugar-phosphate backbone. D) reversing replication forks.
Aerobic exercises do not increase skeletal muscle size, but they do cause various changes in the body. Explain what changes aerobic exercises initiate
What will be an ideal response?
Among known plant species, which of these have been the two most commonly occurring phenomena that have led to the origin of new species?
A) allopatric speciation and sexual selection B) allopatric speciation and polyploidy C) sympatric speciation and sexual selection D) sympatric speciation and polyploidy