The scientists who proposed the operon theory are
A) Monod and Jacob.
B) Watson and Crick.
C) Hardy and Weinberg.
D) Darwin and Mendel.
E) Hershey and Chase.
A) Monod and Jacob.
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Bateson and Punnett crossed two white-flowered lines and saw all purple flowers in the F1 generation. They concluded this was an example of complementary gene interactions because a cross of the F1 plants yielded what ratio in the F2 generation?
A) 8 purple to 8 white B) 16 purple to 0 white C) 0 white to 16 purple D) 7 purple to 9 white E) 9 purple to 7 white
The smallest animals are ectotherms
Indicate whether the statement is true or false
Answer the following questions true (T) or false (F)
1. Most species of sponges live in freshwater environments, but a few species are marine. 2. Cnidarians such as jellyfish have muscle and nervous tissues. 3. Annelids demonstrate the important animal characteristic of body segmentation.