Why are mutations uncommon in normal cells?
a. Only 25% of the genome codes for proteins, therefore the probability is low that a mutation would occur in a
protein coding region.
b. Most mutations occur after DNA replication.
c. Many amino acids are coded for by more than one codon.
d. The mutation rate during DNA replication is 1 in 100 nucleotides.
e. The mutation rate during DNA replication is zero.
ANSWER: c
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a. senescence b. vernalization c. abscission d. dormancy e. chlorosis
____ are alternative forms of a gene that govern the same feature, such as eye color, and occupy corresponding
positions on homologous chromosomes. a. Alleles b. Loci c. Homozygotes d. Coupled traits e. Heterozygotes
Which of the following is a reason to question the sustainability of ethanol production from corn?
A. Gas mileage is better with ethanol than gasoline B. Only waste materials from corn production are used to make ethanol, so it doesn't compete with food production. C. Ethanol burns cleaner than gasoline. D. Farmers use a lot of fossil fuels to grow the corn used to make ethanol. E. Conventional agriculture uses less energy and increases the EROI of corn ethanol.
An example of a mutualism, or +/+ relationship, is ________
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