Defense mechanisms that function to protect the body against many infectious agents are called
a) adaptive
b) innate
c) barriers to entry
d) immunity
Answer: b) innate
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Catabolic pathways are essential for microorganisms to obtain energy, because biosynthetic reactions for cellular growth generally require energy input
Indicate whether the statement is true or false.
When added to water, a base will act as a(n) ____ and cause the pH of the solution to ____
a. proton acceptor; rise b. proton donor; rise c. proton acceptor; fall d. proton donor; fall e. acid; fall
In radishes, two incompletely dominant genes control color and shape. Red and white radishes are
homozygous, while the hybrid is purple. Long and round are homozygous and, if crossed, will produce an oval hybrid. Give the F2 genotypic and phenotypic ratio produced by crossing pure-breed red and long radishes with white and round varieties. What will be an ideal response?
For a prokaryote cell to divide, which of the following must occur?
a. A reproductive signal, replication, segregation of DNA, and cytokinesis b. DNA replication, crossing over, and segregation of DNA c. DNA replication and segregation of DNA d. Cell growth and cytokinesis e. DNA replication, segregation of DNA, and cytokinesis