The concept of evolution has always been connected with some notion of progress–natural selection pushing populations toward better and better adaptations to create "perfect organisms." How would you argue that evolution does not craft perfect
organisms?
What will be an ideal response?
Natural selection adapts populations to their constantly changing environments. It acts on those more fit for their environments, but the environments may change over time. An organism is only more fit than others of its population at a particular time; the organism is not necessarily a perfect match for its environment and is not a perfect organism by human criteria. What constitutes a best match at one time may be a less perfect match as the environment changes.
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Which of the following is a Gram-negative bacterium that acts as a predator on other Gram-negative bacteria, and might be used to control populations of Gram-negative human pathogens in locations such as poultry farms?
A. Salmonella enteritidis B. E. coli C. Vibrio choerae D. Bdellovibrio
The equation A-PO4 + B ? A + B-PO4 would be catalyzed by which of the following classes of enzymes?
A) transferases B) oxidoreductases C) hydrolases D) ligases E) isomerases
What peptide would be synthesized from this mature mRNA sequence: (refer to figure on previous slide)
5' AUG CCA UUC UAA ACG 3'
1.methionine - proline - phenylalanine 2.proline - phenylalanine - tryptophan - threonine 3.proline - phenylalanine - threonine 4.methionine - proline - phenylalanine - tryptophan - threonineWhich of the following is FALSE about
Marfan syndrome? a. It results from an autosomal dominant mutation. b. The affected gene produces a defective form of the protein fibrillin. c. Connective tissues are weakened. d. It affects one in ten thousand men and women. e. None of these is false.