An example of mutualism is:
a. remora fish attached to or following a shark.
b. cleaner shrimp removing parasites from a fish.
c. tapeworm living in the digestive system of a fish.
d. hagfish feeding off a whale killed by an Orca.
e. interactions between the barnacle species Semibalanus and Chthamalus
B
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Each of the following are features of a cloning vector except
A. capacity for large inserts. B. reverse transcriptases. C. genetic markers used to screen for recombinants. D. origin of replication. E. multiple cloning sites.
To create a knockout mouse, after introducing to ES cells a DNA construct in which a specific gene is mutagenized by the insertion of a drug resistance marker, the cells
A) that have incorporated the transgene by homologous recombination grow in the presence of the drug and these are injected into a host blastocyst. B) that lack the transgene grow in the presence of the drug and these are injected into a host blastocyst. C) that have deleted the transgene grow in the presence of the drug and the nuclei are injected into a host blastocyst. D) that lack the transgene grow in the presence of the drug and the nuclei are used for nuclear transfer.
In honeybees, if food is closer than 50 m, scouts
A. look for other food. B. do not perform a dance. C. perform a waggle dance about the food's location. D. perform a round dance about predation risk. E. perform a round dance about the food's proximity.
What is the pH difference (?pH) across a membrane at 310 K if the membrane potential is -0.15 V and the overall Gibb's free energy change across the membrane is -19 .0 kJ mol-1? (R = 8.315 J K-1 mol-1; F = 96,485 J V-1 mol-1)
A) 5.44 B) 2.3 C) 0.74 D) 1.4