As a cell prepares to divide, it makes copies of each chromosome to form ____
a. sister chromatids
b. sister chromosomes
c. chromatin
d. genes
e. centromeres
ANSWER: a
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The portion of the tRNA molecule that binds to the codon on the mRNA is called the
A. anticodon. B. c-codon. C. paracodon. D. complementary codon.
Tetrapod digits are known to be
a. an entirely novel evolutionary structure d. controlled by genes present in the common ancestor of primates b. controlled by the Pitx1 gene e. the result of a mutation in a Hox gene c. controlled by genes that were present in the common ancestor of sharks
Imagine a balloon is made from a membrane that's permeable to water but not sucrose molecules. How would the balloon be affected if it is filled with a 50% sucrose solution and then placed in a beaker of water?
A) The balloon would not change in size or volume. B) The balloon would get smaller as it loses water. C) The balloon would get larger as it gains water. D) The balloon would eventually burst.
Select all of the ways you could have acquired nitrogen that is now in your proteins, DNA, and RNA:
What will be an ideal response?