Which one of the following statements CORRECTLY describes the relationship between an atom and an element?
A) An element is the fundamental unit of an atom.
B) An element is composed of atoms that are joined together by ionic and covalent bonds.
C) An atom is composed of different elements that are joined together by ionic and covalent bonds.
D) An atom is the smallest unit of an element that demonstrates all of the properties of that element.
D
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Which cell lacks a nucleus?
a. bacterial cell b. fungus cell
c. animal cell d. protist cell e. plant cell
Plasma proteins that attack foreign proteins and pathogens are ________.
A) clotting proteins B) fibrinogens C) immunoglobulins D) albumins E) metalloproteins
When the immune systems no longer distinguishes between self and nonself, _____ can result
a. autoimmunity b. anaphylaxis c. viral infections d. minor allergic reactions e. enhanced immune response
Of the following structures, which one is not made of specialized leaf cells?
A. Sclereids B. Guard cells C. Trichomes D. Tendrils E. Spines