The classic "Miller experiments," performed in the 1950s by Harold Urey and Stanley Miller, were the first to show that:
A. the average bill size of a population of Darwin's finches changed with environmental conditions, proving that microevolution can occur within a human lifetime.
B) simple organic molecules, such as amino acids, could form spontaneously in the laboratory under chemical conditions mimicking those of primitive earth.
C. natural selection could occur in a petri dish within a population of bacteria known to have differential abilities to digest complex sugars.
D. water (H2O) could be separated into atmospheric oxygen and H2 gas.
Ans: B) simple organic molecules, such as amino acids, could form spontaneously in the laboratory under chemical conditions mimicking those of primitive earth.
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A. the condenser B. the ocular C. immersion oil D. the cover slip
Xylem
a. involves mainly the shoot system. b. includes lignin-reinforced cell walls. c. involves the roots. d. involve stomata. e. includes pipelines that conduct water from soil to leaves.
Peptides and small proteins are generally too large to be transported into cells using transport proteins or by moving through pores. The macromolecules are brought into the cell using
A) diffusion. B) exocytosis. C) gated channels. D) endocytosis. E) open channels.
A cadherin forms a ________ extracellular interaction with a ________ on another cell
Fill in the blank with correct word.