61. If tyrosine and isoleucine undergo condensation, the new bond that is formed is between the: A) oxygen of the R group and the hydrogen of the amino group.
B) carbon of the R group and the nitrogen of the amino group.
C) carbon of the carboxyl group and the hydrogen of the R group.
D) carbon of the carboxyl group and the hydrogen of the amino group.
E) carbon of the carboxyl group and the nitrogen of the amino group.
14
9.

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1. variations in a population of moths allow for some of its members to be able to adapt to environmental changes. the better adapted of the moths will be able to survive the change and thus prevail as the “fittest” of the species. (a) describe three mechanisms in which variation can occur within a species population. (b) explain which mechanism or mechanisms would be responsible for the survival of a population of peppered moths better than white moths in an environment affected by industrial soot. justify your answer.

Two students are working together on an experiment that measures the effect of different liquid fertilizers on the thickness of plants’ stems. which is most likely to result in the greatest amount of error in their scientific experiment? a. one student measures the plant stem widths by using calipers. the other student measures the widths of the same plant stems again by using a different pair of calipers. b. one student measures the plant stem widths by using calipers. the other student types the measurements as they are taken into a computer spreadsheet. c. one student weighs liquids for the experiment by using a calibrated scale. the other student weighs liquids for the experiment by using a different calibrated scale.