Active transport is different from simple diffusion in that active transport
A. requires energy.
B. All of the answer choices are correct.
C. moves molecules against a concentration gradient.
D. requires transport proteins embedded within the cell membrane.
E. moves molecules from an area of lower concentration to an area of higher concentration.
B. All of the answer choices are correct.
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Which of the following is true of the humoral immune response and not true of the cell-mediated immune response? Only the humoral immune response _____
A) involves T cells at some level B) require CD8+ cells for activation C) involves destroying entire cells and not just the pathogen D) uses antibodies as its main weapon
A child is believed to have a Toxocara cati infection in his eye, which he acquired after playing with a stray cat for several weeks. A serum titer was performed, which revealed a titer of 1:8 . This laboratory value can be interpreted as:
a. normal. b. insignificant. c. diagnostic. d. negative.
A horizontal overlap of the maxillary teeth creating a protrusion is an
a. openbite b. overbite c. overjet d. crossbite.
What time point represents G2? 
A. 1 B. 2 C. 3 D. 4