In a polar covalent bond, the atoms of the different elements do not share electrons equally because
a. one is a metal and one is a non-metal.
b. both are metals.
c. both are non-metals.
d. one element has more neutrons.
e. one element has more protons.
E
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Two populations that have no gene flow between them are likely to
(a) become more different with time. (b) become more alike with time. (c) become more alike if the directional selection pressures are different. (d) stay the same unless mutations occur.
In a eukaryotic cell, a gene that is initially transcribed is 1500 nucleotides in length. The mature mRNA for the product is 1200 nucleotides in length. What is the most probable reason for the discrepancy?
A) a mutation that results in a shorter product B) removal of introns C) removal of exons D) mRNA breakage E) both choices A and D
For each acetyl CoA molecule that enters the citric acid cycle, two CO2 molecules are produced
__________________ Indicate whether the statement is true or false.
________ are modified leaves that are often green and surround the flower bud
A) Stigma B) Filaments C) Ovules D) Petals E) Sepals