Of the items listed, which is the smallest that you can see with the unaided eye?
A) Frog embryo
B) Ribosomes
C) DNA molecule
D) Human skin cell
E) Virus
A
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What region of the 5-week embryo gives rise to the midbrain?
a. telencephalon b. diencephalon c. mesencephalon d. metencephalon e. myelencephalon
Secondary succession occurs ____
a. after a fire b. on a new sand dune c. on bare rock d. immediately after the formation of a man-made lake e. on a newly-formed volcanic island
The main antigen presenting cells of the body are:a
macrophages and B cells only. b. macrophages and dendritic cell only. c. dendritic cells and B cells only. d. dendritic cells and plasma cells only. e. macrophages, B cells and dendritic cells.
Compare and contrast the ways in which animal, plant, and bacterial viruses gain entry into their host cells
What will be an ideal response?