Each molecule of hemoglobin can bind up to six molecules of oxygen
Indicate whether the statement is true or false.
ANSWER: False - four
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Beetle pollinators of a particular plant are attracted to its flowers' bright orange color. The beetles not only pollinate the flowers, but they mate while inside of the flowers. A mutant version of the plant with red flowers becomes more common with the passage of time. A particular variant of the beetle prefers the red flowers to the orange flowers. Over time, these two beetle variants diverge from each other to such an extent that interbreeding is no longer possible. What kind of speciation has occurred in this example, and what has driven it?
A) allopatric speciation; ecological isolation B) sympatric speciation; habitat differentiation C) allopatric speciation; behavioral isolation D) sympatric speciation; sexual selection E) sympatric speciation; allopolyploidy
The neural crest consists of:
A. embryonic cells on each side of the neural tube B. embryonic cells that form the kidney C. clusters of Hox genes D. cells that form hair follicles E. cells that lie along the crest of the spine
In what molecular form does the human body store excess carbohydrates in muscles and the liver?
What will be an ideal response?
Why are endospores used to measure the effectiveness of autoclave sterilization?
A) Endospores are easy to store in the lab until needed. B) Endospores are very simple structures and easy to detect. C) Endospores are very hard to kill. D) Endospores are composed of all the molecules found in living cells. E) Endospores of different bacteria are destroyed at different temperatures and can be used to calibrate autoclave temperatures.