A package of histones with DNA wrapped around them forms spherical structures called

a. nucleoli.
b. chromatin.
c. nucleosomes.
d. ribosomes.
e. lysosomes.


C

Biology & Microbiology

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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.

Biology & Microbiology

Which is a density-independent factor?

a. competition b. predation c. earthquakes d. parasitism e. disease

Biology & Microbiology

Which major biome type contains most of Earth's biodiversity?

A) desert B) tundra C) grasslands D) forests

Biology & Microbiology

The fluid fraction of the blood is called the _______.

a) syrup b) nasum c) residual factor d) serum

Biology & Microbiology