A serum sample from a patient is examined on an electron microscope, and observed to contain Dane particles, filamentous, and spherical virion particles in abundance. This observation indicates infection with
A. human herpesvirus 1.
B. EBV.
C. hepatitis B.
D. hepatitis D.
E. VZV.
Answer: C
You might also like to view...
____ assist and nourish cells that transmit electrical signals
a. Receptors b. Neurons c. Effector cells d. Glial cells e. Signal cells
In an experiment on the effects of deforestation of a portion of a northern temperate deciduous forest, all the trees were removed from a small mountainside watershed area and herbicides were applied for three years to prevent regrowth. Measurements of the concentration of calcium (an important nutrient) in runoff water were taken both before and after the deforestation. Monthly measurements also were made in a similar watershed in another part of the same forest that had been left undisturbed. The findings are displayed in the graph below. (There is an image in your packet #101-105) 2002 test Based on the graph, which of the following best describes why losses of calcium did not occur immediately in the deforested watershed?
(A) It takes months to leach calcium from the soil. (B) Other minerals were more soluble and were leached out first. (C) The deforestation occurred during the winter when runoff was low. (D) Calcium is hard to detect in small amounts. (E) Leaves do not appear on deciduous trees until the spring.
____ are used to allow gas exchange in leaves whereas _____ are used to maximize water uptake in roots
A. stomata, root hairs B. xylem, root hairs C. stomata, phloem D. trichomes, xylem
In the human birth process, what does labor refer to?
A) the last part of the process when the fetus is expelled from the vagina B) regular contractions of uterine muscles C) the period between birth and expulsion of the placenta D) the period between the first contraction and dilation of the cervix