Which one of the following ribosomal subunits has three different pieces of rRNA in it?
A. 30S
B. 40S
C. 50S
D. 60S
Answer: D
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To be useful to scientists, a hypothesis must be ________; in other words, the hypothesis must be able to be confirmed or discredited.
Fill in the blank(s) with the appropriate word(s).
When scientists inserted the Bt toxin gene into plant cells they created a Select one:
a. transgenic plant. b. monohybrid. c. clone. d. stem cell. e. new species.
Currently, two extant elephant species (X and Y) are classified in the genus Loxodonta, and a third species (Z) is placed in the genus Elephas. Thus, which statement should be true?
A) Species X and Y are not related to species Z. B) Species X and Y share a greater number of homologies with each other than either does with species Z. C) Species X and Y share a common ancestor that is alive today. D) Species X and Y are the result of artificial selection.
Vertebrae are differentiated during embryonic development by the
A) amount of spongy bone present. B) length of the backbone. C) degree of structural support needed. D) pattern of homeotic gene expression.