A dendritic cell with an antigen displayed on its surface is called a(n) ____
a. cytotoxic T cell
b. plasma cell
c. antigen presenting cell
d. major histocompatibility complex
e. CD4+ T cell
ANSWER: c
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Horses and donkeys are closely related species that can interbreed. However, the offspring produced are usually sterile and cannot reproduce. What term would best describe the offspring from this mating?
A. alloploid B. euploid C. trisomic D. polyploid E. monosomic
Because archaeons lack peptidoglycan in their cell walls ________.
A. some have an outer layer of complex polysaccharide and some have an outer layer of protein B. some have an outer layer of complex polysaccharide C. some have an outer layer of protein D. they must always be grown in isotonic medium
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Which statement regarding the scientific method is false?
A) Original hypotheses are formed after an experiment. B) Experiments need to be repeatable. C) Inductive reasoning is used to form a hypothesis. D) The control and experimental group are identical except for one variable. E) Observations are used to form a hypothesis.