Molecules made primarily of carbon and hydrogen are called hydrocarbons. How many hydrogen atoms are present in each of the following molecules?
A five-carbon hydrocarbon molecule with four of the carbons linked by a single covalent bond, and with the fifth carbon attached by a single bond as a branch to the second carbon in the chain?
A. 6
B. 8
C. 10
D. 12
Answer: D
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People with type A blood have red blood cells that express one type of recognition protein, while those with type B
blood express a different recognition protein. People with AB blood express both recognition proteins. Why can a person with AB blood receive blood from a person with type A, but a person with type A blood cannot received blood from a person with type AB?
What will be an ideal response?In the experiment with Peacock butterflies, the
working hypothesis is that a. mimicry confuses both predator and prey. b. mimicry conveys a selective advantage to the prey. c. birds are capable of learning. d. birds are agents of evolution. e. unpalatable species display distinctive wings.
Which statement best describes an electron transfer chain?
A. It generates energy from carbohydrates. B. It is used by cells to dispose of excess electrons. C. It utilizes ATP to synthesize nutrients. D. It transfers energy, stepwise, from one compound to another. E. It requires activation by oxygen.
The blind spot is located in the ____
a. cornea b. optic disk c. fovea d. sclera e. retina