What type of RNA carries the information that specifies a protein?
transfer RNA
ribosomal RNA
messenger RNA
double-stranded RNA
complementary RNA
messenger RNA
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Which stage of microtubule assembly is the stage in which nucleation occurs?
A) sheets of protofilaments B) closing of microtubules C) oligomers D) dimers E) elongation
Which factor has the least effect on the amount
of incoming light that strikes an area? a. latitude b. temperature c. the slope of the land that is exposed to the incoming light d. the amount of cloud cover e. season
Figure on p. 737
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Use the figure above showing the process of gastrulation to answer the following question.
The letter "A" in the accompanying figure represents ____.
A. ectoderm B. endoderm C. mesoderm D. neural plate E. yolk
In addition to fertilizing the egg, sperm also ____
a. assist the fertilizing sperm in penetrating the egg b. trigger chemical changes in the egg c. dissolve the outer barriers surrounding the oocyte d. release chemicals to speed cell division in the zygote e. trigger chemical changes in the egg that prevent the entry of more than one sperm