Quiz 5 - General Biology & Lab (Extraction)

In the Watson and Crick model of DNA, the "steps" of the ladder are composed of

• a sugar and a phosphate molecule

• sugars

• two purines

• a purine and a pyrimidine

Which of the following statements about DNA replication is NOT correct?

• Unwinding of the DNA molecule occurs as hydrogen bonds break

• Replication occurs as each base is paired with another exactly like it

• Complementary base pairs are held together with hydrogen bonds

• The process is known as semiconservative replication because one old strand is conserved in the new molecule

Which is NOT true about the genetic code?

• Most amino acids have only one codon

• It produces 64 different possibilities of base sequences

• It is composed of a triplet code of three bases per codon

• It contains start and stop codons as instructions

The correct sequence of events in translation is:

• elongation, initiation, termination

• termination, elongation, initiation

• elongation, termination, initiation

• initiation, elongation, termination

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Transcription of a part of a DNA molecule with a nucleotide sequence of A-A-A-C-A-A-C-T-T results in a mRNA molecule with the complementary sequence of

• T-T-T-G-A-A-G-C-C

• G-G-G-A-G-A-A-C-C

• U-U-U-G-U-U-G-A-A

• C-C-C-A-C-C-T-C-C

Which of the following is NOT involved in natural selection?

• Organisms differ in reproductive success

• There is always competition for resources

• There are inheritable variations in populations

• The desired traits are chosen by a breeder

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In his theory of natural selection, Darwin incorporated the premise that available resources were not sufficient for all members of a population to survive. Darwin adopted these ideas of competition and survival from

• Malthus

• Lamarck

• Cuvier

• Erasmus Darwin

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The organisms on the Galápagos Islands that were most important to the development of Darwin’s theory of natural selection were

• snails and fish

• plants and fungi

• rabbits and hares

• tortoises and finches

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A population must have ______ for natural selection to occur.

• abundant resources

• many individuals

• inheritable variation

• a stable environment

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All of the following are examples of natural selection EXCEPT

• the reduction in beak length of scarlet honeycreepers when they changed food sources

• a rise in bacterial resistance to antibiotics

• the distribution of dark and light colored peppered moths in Britain

• the 150 breeds of dogs developed from ancestral wolves

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