Which traits are considered the most favorable?
a. the ability to run very fast
b. any ability that confers an advantage under the current environmental conditions
c. the ability to fly for travel or to escape predators
d. No traits are considered favorable under any circumstances.
b. any ability that confers an advantage under the current environmental conditions
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A ribozyme catalyzes a reaction on itself and actually changes shape. This is an example of
A. intra-enzyme reactions. B. inter-enzyme reactions. C. intramolecular catalysis. D. intermolecular catalysis.
In the polymerase chain reaction (PCR) the DNA is first heated to break the hydrogen bonds between the two polynucleotide strands, producing two single-stranded molecules that will serve as templates. Which of the following choices would be the second step in PCR?
1.The mixture is cooled and primers bind to complementary DNA regions. 2.Taq polymerase synthesizes a complementary DNA strand for each single-stranded molecule. 3.The mixture is heated and primers bind to complementary DNA regions. 4.The DNA is cut into fragments with a restriction enzyme. 5.The DNA is stained.
Which of the following is not correctly paired?
a. eosinophil: lymphocyte b. T helper cell: activates B cells c. natural killer cell: lyses infected cells d. plasma cell: a subset of B cells e. B cell: involved in antibody mediated responses
Suppose you use a dissecting microscope to observe organisms that have colonized discs of densely packed, fibrous wood (Masonite plates) that have been submerged in 6 inches of lake water for 8 weeks. You see insect cases (protective shelters), insect
larvae, and newly emerged insects with wings. You determine that you are looking at an insect species A) that undergoes incomplete metamorphosis. B) that undergoes complete metamorphosis. C) with a body plan of radial symmetry. D) with incomplete digestive tracts.