The common name for the disease caused by human parvovirus B19 is
A. kissing disease.
B. fourth disease.
C. fifth disease.
D. shingles.
E. Reyes' syndrome.
Answer: C
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A child swinging on a swing utilizes which type(s) of energy?
a. kinetic energy only because the child is in constant motion b. potential energy only, because the child has to invest energy to get the swing to move c. chemical energy only, because it is the child's metabolism that powers the muscles that make the swing move d. kinetic and potential energy only, but in constantly changing ratios: when changing direction it is pure potential energy; at the bottom of the arc, it is pure kinetic energy e. kinetic, potential, and chemical energy: the child powers the swing with chemical energy in the muscle, cells and the swing moves like a pendulum with changing ratios of kinetic and potential energy.
When examining an electron micrograph of cells obtained from a new deep-sea life-form, you notice that the plasma membranes appear as two dark lines separated by a lightly stained region
Which of the following investigator(s) used a similar observation as the basis for a model of membrane structure? A) Robertson B) Gorter and Grendel C) Unwin and Henderson D) Overton E) Singer and Nicolson
Which organelle is a stack of membranous sacs that sort proteins to their proper cellular location?
A) centriole B) endoplasmic reticulum C) Golgi apparatus D) lysosome
If a plant is kept in the dark
A) the stomata continue their daily rhythm of opening and closing. B) the stomata will remain closed the entire time that the plant is in the dark. C) the stomata will remain open the entire time that the plant is in the dark. D) the guard cells will open as water is added.