How do smoking and alcohol consumption affect cancer risk?
A) Smoking combined with alcohol consumption results in greater cancer risk.
B) Drinking alcohol results in greater cancer risk than smoking.
C) Smoking or drinking alcohol result in similar cancer risk.
D) Smoking results in twice the cancer risk of drinking.
A
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What was the big piece of the puzzle that was
missing from Darwin’s theory of evolution in his day?
a. a selection mechanism b. a method of inheritance c. a lack of variation in the organisms he studied d. a mechanism for reproduction e. more than one of these
If you wanted to genetically engineer a goat so that it had finer muscle control than other goats, what would be your goal?
A. fewer muscle fibers per motor neuron B. more motor neurons C. more muscle fibers D. larger sarcomeres E. longer motor neurons
In which cycles are the nutrients found in a gas form?
a. atmospheric cycles b. global cycles
c. water cycles d. sedimentary cycles e. plant-animal cycles
Which of the following statements about how fruit flies can develop an eye in the middle of a leg is true?
(a) When the Ey gene is expressed in adult leg cells, these cells de-differentiate and become eye cells. (b) The Ey gene encodes a transcription regulator that is the only transcription regulator used to produce a fruit-fly eye. (c) When the Ey gene is introduced into cells that would normally give rise to a leg, the transcription regulators used to control its expression in the leg are different from those that are normally used to control Ey expression in the eye. (d) All the eye cells found in the adult leg are a single cell type and have identical characteristics.