Which of the following are antigen-presenting cells?

A. Macrophages
B. B cells
C. Cytotoxic T cells
D. Macrophages and B cells
E. Macrophages, B cells and cytotoxic T cells


D. Macrophages and B cells

Biology & Microbiology

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The "missing link" between birds and dinosaurs was found when fossils of ________ were unearthed in a German quarry

a. Archaeopteryx b. Phascolarctos cinereus c. Sphenodon d. Saurophaganax

Biology & Microbiology

Why is it inaccurate to refer to early synapsids as "mammal-like reptiles"?

A) Mammals did not evolve from synapsids. B) Synapsids do not nest within the clade Reptilia as we define it now. C) The taxon Synapsida is actually polyphyletic. D) The earliest synapsids had no features that we associate with reptiles today. E) Synapsids and reptiles lived on different continents in the late Paleozoic.

Biology & Microbiology

The organ system that is involved in the coordination of body activities and that uses hormones as chemical signals that are secreted into the bloodstream is called the __________ system.

Fill in the blank(s) with the appropriate word(s)

Biology & Microbiology

After telophase I of meiosis, the chromosomal makeup of each daughter cell is _____

A) diploid, and the chromosomes are each composed of a single chromatid B) diploid, and the chromosomes are each composed of two chromatids C) haploid, and the chromosomes are each composed of a single chromatid D) haploid, and the chromosomes are each composed of two chromatids

Biology & Microbiology