________ discovered that a variety of amino acids and organic acids could be produced in the laboratory in a reducing atmosphere with electrical sparks.
A. Sidney Fox
B. Stanley Miller
C. Thomas Cech
D. Aleksander Oparin
E. Graham Cairns-Smith
Answer: B
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If scientists want to develop plants better adapted to certain climates they need information about the plant's ability to:
A. bind membrane proteins B. transport solutes passively C. make dehydrins D. take up minerals E. transport calcium
When artificial methods are used to modify living organisms to produce new compounds or perform new functions, what is this process called?
a. bioremediation b. bioradiation c. biotechnology d. biotechnicality
Answer the following statements true (T) or false (F)
1. Streptomyces are aerobic soil bacteria that produce over two-thirds of our antibiotics of natural origin. These antibiotics should also be effective in killing Streptomyces. 2. Streptomyces are obligate aerobic soil bacteria that infect many plant roots, causing scabs on their leaves. You would expect to find more Streptomyces near the surface of the soil. 3. Antibiotics usually are not dangerous to use in treating bacterial infections because most antibiotics exploit structures and functions in bacteria that are not present in host cells. 4. Pili are bacterial structures used primarily for motility. 5. Autotrophs must acquire carbon from organic molecules produced from other organisms.
The membrane potential of a neuron is defined
as the
a. measured capacity of a neuron to create an electrical impulse. b. voltage in the neuron plasma membrane. c. threshold potential of a neuron. d. the electric gradient across a neuron’s plasma membrane. e. amount of voltage it takes to stimulate a neuron to fire.