In order to transfer gene a to an F- cell, the sex pilus must be in place for at least ____ minutes
a. 1
b. 2
c. 3
d. 4
e. 5
C
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In testing a hypothesis that "territorial defense in European robins is a fixed action pattern that is released by the sight of orange feathers,"
researchers found that robins defended their territory by attacking anything that was of similar size and had an orange patch. What experiment would you perform next to determine that the color initiated the defense response? A) Repeat the experiment using a blue patch instead of an orange patch. B) Repeat the experiment by removing the patch completely. C) Repeat the experiment by using a model of a robin that was twice the size of a normal robin but with a small orange patch. D) Repeat the experiment by using a model of a robin that had an orange patch that was twice the size of a normal patch.
The nucleotides within DNA are composed of a
A. phosphate group, ribose sugar, and nitrogenous base. B. sulfur group, ribose sugar, and nitrogenous base. C. phosphate group, deoxyribose sugar, and nitrogenous base. D. sulfur group, deoxyribose sugar, and nitrogenous base. E. phosphate group, hexose sugar, and nitrogenous base.
The amnion is to the amniotic fluid as the allantois is to the
A. blood cell precursors. B. umbilical blood vessels. C. chorionic villi. D. yolk. E. amniotic cavity.
Analysis of a certain polymer shows that it contains phosphate groups, ribose groups, and pyrimidines
Based on this information, which of the following is the best description of this compound? a. It is most likely ribonucleic acid. b. It is DNA. c. It is an inorganic compound. d. It contains thymine. e. It is a polypeptide