The evolution of roots was an adaptive trait in early land plants because:
A. vascular tissue helps transport sugars.
B. they allowed plants to absorb water from
submersed stems.
C. they allowed vascular plants to expand
into drier habitats.
D. they inhibit plants growing too tall.
E. they reduce the rate of plant dispersal.
C
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Augustus Waller invented a machine that measures
a. blood pressure when the ventricles are contracting. b. blood pressure when the ventricles are relaxed. c. cardiac output. d. electrical activity of the brain. e. electrical activity of the heart.
Generation of an action potential by a neuron may ultimately stimulate
A) another nerve cell. B) skeletal muscle cells. C) gland cells. D) smooth muscle cells. E) All of the above may be stimulated by a signal.
Which of the following applications of biotechnology results in an insect-resistant plant?
A) Banana-based vaccine against pathogenic Escherichia coli B) Insulin production by bacteria C) Bt toxin production by soybeans D) Growth-hormone-treated cows E) Herbicide-resistant corn
Dolly's lifespan might have been extended by giving her supplementary ___.
A. Telomeres B. Thymine, adenine, and guanine nucleotides C. Growth hormone D. Telomerase E. Cytokines