Describe the four requirements for chemical evolution and why each was essential. What will be an ideal response?
Concepts to Consider: Little or no free oxygen; a source of energy; chemical building
blocks including water, dissolved inorganic minerals, and gases; plenty of time.
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The "powerhouse" of the cell is the
a. mitochondrion. b. Golgi body. c. nucleus. d. ribosome. e. endoplasmic reticulum.
Oral infections with herpes simplex virus 1 can lie dormant in nerve cells for years, and when a patient becomes stressed, the virus is released, forming cold sores on the lips. While lying dormant the virus is in which of the following states?
a. Lysogenic b. Symptomatic c. Latent d. Replicative e. Infective
What cellular process is represented in the accompanying figure?
a. lysis
b. exocytosis
c. cotransport
d. pinocytosis
e. facilitated diffusion
Suppose that a DNA change results in the substitution of one codon for another, but the codon specifies the same amino acid as it did originally. What type of mutation has occurred?
a. a chromosomal mutation b. a frameshift mutation c. a silent mutation d. a missense mutation