Long, snowy winters as well as evergreen trees such as pine and fir are found in ________
A) chaparral
B) temperate broadleaf forests
C) coniferous forests
D) temperate grasslands
C
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Which of the following is the light-absorbing compound used by photoreceptors?
A. opsin B. retinal C. rhodopsin D. both opsin and retinal
The significance of Fred Griffith’s experiment in
which he used two strains of Streptococcus pneumoniae is that a. pathogenic bacteria function differently in mice than in other organisms. b. it demonstrated that harmless bacteria can become transformed into disease-causing bacteria by some association with pathogenic bacteria. c. it established that pure DNA extracted from disease-causing bacteria transformed harmless strains into killer strains. d. dead cells lose their genetic information. e. the genetic material is DNA, not protein.
The movement of water through a membrane is dependent on
a. the concentration of solute. b. channel proteins. c. the extent of packing of the phospholipids. d. active transport. e. endocytosis.
You woke up this morning with a headache from staying up cramming last night, so you took an aspirin. This should
A) help because aspirin blocks the production of endorphins. B) help because aspirin stimulates the production of prostaglandins. C) help because aspirin inhibits prostaglandin synthesis. D) help because aspirin increases neurotransmitter levels. E) make the headache worse because aspirin increases the production of endorphins.