Someone who inconspicuously harbors a pathogen and spreads it to others is a
A) Carrier
B) Reservoir
C) Source
D) Vector
E) Fomite
A) Carrier
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The cell walls of most fungi are composed of
A. chitin. B. cellulose. C. dentine. D. peptides. E. glycerol.
The common ancestor of sponges and other animals was probably
A) multicellular with tissues but without organ systems. B) multicellular with tissues and many organ systems. C) unicellular. D) multicellular without tissues. E) multicellular with tissues and a few organ systems.
A(n) ________ is the protein shell around the nucleic acid core of a virus.
Fill in the blank(s) with the appropriate word(s).
Cancer is more common in the elderly because: (Select all that apply)
a. The immune system grows stronger with more tendency to destroy malignant cells. b. Mutations accumulate over time. c. The DNA and tissue repair mechanisms are less efficient as we age.