If a dihybrid cross is begun with a P1 generation of a plant that produces smooth and yellow peas,
crossed with a plant that produces wrinkled green peas, the F2 plants will have either smooth yellow
peas or wrinkled green peas. Indicate whether the statement is true or false.
F
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One interesting and surprising finding regarding the regulation of the ara operon is that it is under both positive and negative control. What protein is responsible for the dual action of this operon?
A) AraC is responsible for both the positive and negative control of the ara operon. B) RNA polymerasse is responsible for both the positive and negative control of the ara operon. C) AraD is responsible for both the positive and negative control of the ara operon. D) DNA polymerase is responsible for both the positive and negative control of the ara operon. E) AraBAD is responsible for both the positive and negative control of the ara operon.
An example of mechanical isolation would be
a. flowers that bloom months apart. b. two organisms that are pollinated by different insects. c. two organisms that have different habitats. d. two organisms that have incompatible gametes. e. two organisms that have different mating rituals.
One theory holds that complex molecules formed on clay. This is because clay attracts
a. oxygen. b. lipids. c. nucleic acids. d. amino acids. e. carbon.
Discovery science is primarily based on ________
A) hypothesis testing B) deduction C) experimentation D) observation