As a solution becomes more acidic:
A) H+ concentration increases and pH decreases
B) pH increases
C) H+ concentration decreases
D) pH decreases
E) H+ concentration increases
Ans: A) H+ concentration increases and pH decreases
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Which one of the following statements about the methylation state of CpG islands is incorrect?
A. Cells can heavily methylate CpG islands of viral DNA sequences in order to restrict their expression. B. Cancer cells often methylate CpG islands in genes that could restrict cell growth. C. The methylation state of CpG islands provides a way to turn genes on or off. D. The methylation state of CpG islands is rigid and will not change over time. E. The methylation state of CpG islands can change in response to the environment.
Mutation is defined as the:
a. change of the bacterial genotypes through the exchange of DNA from one cell to another. b. internal change in the original nucleotide sequence of a gene or genes within an or-ganism's genome. c. process by which genetic elements such as plasmids and transposons excise from one genomic location and insert into another. d. uptake of free DNA from the environment and recombination with the recipient's homologous DNA.
Nonspecific cell responses depend on the actions of lymphocytes, natural killer cells, and dendritic
cells. ____________________ Indicate whether the statement is true or false.
Marsupials are a very ancestral form of mammal, evolving before placental mammals over 70 million years ago. Today Australian marsupials can be compared to placental mammals on other continents.
When you compare Australian marsupials to placental mammals today
A. the marsupial fossils look remarkably similar to the placental mammals of today. B. the marsupials are all very primitive, having changed very little during the last 70 million years. C. the marsupials are very similar to placental mammals in the ways they have adapted to similar ecological niches. D. living marsupials are little changed from the earliest marsupial fossil forms. E. the marsupials have evolved much more rapidly than placental mammals and are more highly adapted.