A package of histones with DNA wrapped around them forms spherical structures called
a. nucleoli.
b. chromatin.
c. nucleosomes.
d. ribosomes.
e. lysosomes.
C
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Which of the following is a difference between B cells and T cells?
A) One has a major role in antibody production, while the other has a major role in cytotoxicity. B) One binds a receptor called BCR (B-cell receptor), while the other recognizes a receptor called TCR (T-cell receptor). C) B cells are activated by free-floating antigens in the blood or lymph. T cells are activated by membrane-bound antigens. D) T cells are produced in the thymus and B cells are produced in the bone marrow.
Which is a density-independent factor?
a. competition b. predation c. earthquakes d. parasitism e. disease
Which major biome type contains most of Earth's biodiversity?
A) desert B) tundra C) grasslands D) forests
The fluid fraction of the blood is called the _______.
a) syrup b) nasum c) residual factor d) serum