The descriptive groupings of virus into categories such as icosahedral and helical are based on
A. the presence or absence of an envelope.
B. the type of nucleic acid.
C. the shape of the nucleocapsid.
D. the mechanism of entry into host cells.
Answer: C
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Which of the following correctly lists the types of cellular communication from shortest to longest distance travelled by the signaling molecule to reach its responding cell?
A. paracrine, autocrine, endocrine B. autocrine, endocrine, paracrine C. autocrine, paracrine, endocrine D. endocrine, paracrine, autocrine
Evolution is the result of selecting only those mutations that result in an increased reproductive success
Indicate whether the statement is true or false
About ____ percent of the 295,000 known
species of flowering plants coevolved with animal pollinators. a. 50 b. 60 c. 70 d. 80 e. 90
A ______ usually is the lymphoid tissue first to encounter pathogens and antigens that enter via the nose and mouth.
A. lymph node B. tonsil C. thymus D. spleen