Which of the following analogies best fits the manner in which amino acids form proteins?
a. A limited selection of bricks can be put together in an infinite variety of architectural styles
b. Many identical pearls are strung together to form one necklace.
c. Each student in a university is unique but they all belong to the same organization.
d. A child links four colors of plastic beads together in a repeating pattern.
a
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Persistent developmental disorders include
a. Alzheimer's disease. b. Parkinson's disease. c. Multiple sclerosis. d. autism. e. Creuzfeldt-Jakob disease
Which pairing of occurrence and date is NOT correct?
Select one: a. origin of invertebrates—630 million years ago b. origin of life—4.6 billion years ago c. origin of eukaryotic cells—2.1 billion years ago d. origin of prokaryotic cells—3.5 billion years ago e. chordate evolution—545 million years ago
Unusual cellular extensions called prosthecae are associated with which of the following groups of proteobacteria?
A) alphaproteobacteria B) betaproteobacteria C) gammaproteobacteria D) deltaproteobacteria E) epsilonproteobacteria
Which is an example of clones that already are produced by nature?
A) two plants of the same species B) golden corn C) fraternal twins D) identical twins