A change in genotype, but not in phenotype, is most likely due to ________.
A. a point mutation in the third position of a DNA triplet
B. a nonsense mutation at the beginning of a gene
C. thymine dimer formation in the coding region of a gene
D. a mutation that leads to a frameshift in the middle of a gene
Answer: A
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Immunotherapies such as immunotoxins are being tested to treat
a. pertusis. b. tetanus. c. pneumonia. d. HIV. e. measles.
Which of the following best describes why the disks rose to the surface faster in the more concentrated hydrogen peroxide solutions?
a. There was more enzyme present in the more concentrated solutions. b. A greater amount of heat was generated in the more concentrated solutions. c. The more concentrated solutions lowered the activation energy of the reaction. d. The higher substrate concentrations in the more concentrated solutions speeded the reaction. e. The density of the water was lower in the more concentrated solutions.
Molecules of extrachromosomal DNA in bacteria are known as
a) Golgi complexes b) lysosomes. c) plasmids. d) ribosomes.
The richest marine ecosystems are those in the open water where large fish abound.
Answer the following statement true (T) or false (F)