Phenotype means
a. the combination of alleles in an individual.
b. the genes an individual has.
c. the number of chromosomes in an individual.
d. the observable expression of the genes in an individual.
e. the number of gametes in an individual.
Answer: d. the observable expression of the genes in an individual.
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Vertebrates such as ____ have both exo- and endoskeletons
a. birds b. humans c. turtles d. lobsters e. fish
Monotremes
A. include the anteater and duck-billed platypus. B. are egg laying mammals. C. nurse their young. D. All of the answer choices are correct.
Human embryos differ from bird embryos in that
A) bird embryos undergo metamorphosis to become sexually mature adults. B) bird embryos have an extra membrane, the allantois, that is not found in human embryos. C) human embryos have a yolk sac, but it contains very little yolk. D) human embryos do not undergo cleavage. E) human embryos have no yolk sac.
Attachment of herpesviruses results in ________, a process in which the host cell facilitates viral entry.
A. direct penetration B. membrane fusion C. endocytosis D. exocytosis E. lysogeny