Which of the following is a fundamental characteristic of the Notch pathway?
A) It works through nuclear signals involving the lac operon.
B) It works through direct cell-to-cell contact.
C) It allows mRNAs to accumulate in the posterior portion of the Drosophila embryo.
D) It provides symmetry to plant flowers.
E) It directs mRNAs to antisense systems in the posterior portion of all organisms.
B
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In addition to their characteristic cilia, most ciliates contain two types of
A. nuclei. B. chloroplasts. C. flagella. D. wood-digesting enzymes. E. cysts.
Uracil can pair with
a. ribose. b. adenine. c. cytosine. d. thymine. e. guanine.
As of 2008, human cloning was banned in the United States. What are the arguments for maintaining such a ban?
What will be an ideal response?
Deuterostomes evolved during the:a
Cambrian. b. Proterozoic. c. Paleozoic. d. Cenozoic. e. Devonian