In Griffith's experiments,
A. mice infected with heat-killed virulent bacteria and live nonvirulent bacteria developed pneumonia and died.
B. nonvirulent bacteria transformed the virulent bacteria into a nonvirulent variety.
C. mice infected with heat-killed virulent bacteria and heat-killed nonvirulent bacteria developed pneumonia and died.
D. mice infected with live nonvirulent bacteria developed pneumonia and died.
Answer: A
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Red-green color blindness is controlled by an X-linked gene in humans. The allele that causes color blindness is recessive to the allele for normal vision. A man and woman both with normal vision had color-blind fathers. If this man and woman have a child, what is the probability that the child will be color blind?
A) 1/2 B) 1/4 C) 1/8 D) 1/3 E) 0
During transcription, a portion of a cell's DNA is converted to a complimentary strand of mRNA. The mRNA is eventually used as the blueprint for making one or more proteins, but not immediately
A short lag time is necessary between transcription and the initiation of translation. Why?
Grand Rapids variety of lettuce produces seeds that will not germinate unless they are exposed to light
Phytochrome is also involved in that exposure to red light stimulates germination and far-red light inhibits germination. However, the effect of red light can be reversed by an immediate exposure to farred light--and vice versa. You design an experiment in which you expose seeds of Grand Rapids lettuce first to red light, then immediately to far-red light, and then immediately to red light again. Would these seeds germinate? Use your knowledge of the phytochrome molecule to explain your reasoning. What if the seeds were exposed first to red light, then immediately to far-red light, then immediately to red light again, and then immediately to far-red light again What will be an ideal response?
Plant cell walls consists mainly of ________.
A. chitin B. peptidoglycan C. cellulose D. chlorophyll