Due to the flu virus' ability to _________ rapidly, a new vaccine is needed for the flu each year.
Fill in the blank(s) with the appropriate word(s).
Mutate
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Pheromones are
a. used in nonvocal communication. b. found only in the invertebrates. c. signals to members of other species. d. types of internal hormones that control maturation. e. involved only in learned behaviors.
The surface area of a cube increases how in relation to its length (l)?
A) l B) l2 C) l3 D) 6l2
Which of the following occurs during gastrulation?
a. formation of the gray crescent region b. formation of ectoderm, mesoderm, and endoderm c. closure of the archenteron d. formation of the blastocoel e. radial cleavage takes place
Which is true concerning cell division?
A. During meiosis I, sister chromatids pair up and then are separated B. An asexually reproducing organism needs mitosis to produce a genetically diverse set of daughter cells in order to maintain genetic diversity C. When comparing the parent and daughter cells, meiosis differs in both the ploidy level and ploidy number, whereas mitosis differs in neither D. During crossing over, an allele for brown eyes may be switched with an allele for brown hair