Proteins that bind to foreign matter making it easier for phagocytosis are called
A) integrins.
B) opsonins.
C) leukotins.
D) selectins.
E) heparin.
Answer: B) opsonins.
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What is the purpose of the watery fluid secreted by the serosa of the human digestive tract?
a. emulsifies fats b. initiates peristalsis c. kills bacteria d. neutralizes acidic conditions e. reduces friction between nearby organs
You are a doctor examining a patient who had a bad fall. You conduct the patellar reflex test by tapping on his right patellar tendon. The patient's leg does not move in response to your tap. What can you conclude from this test?
A. The patient has definitely sustained a brain injury. B. The patient may have a motor nerve injury. C. The patient may have a sensory nerve injury. D. The patient may have a spinal cord injury. E. More than one of the answers given are correct.
Scientists can compare the relationships between all modern species by examining a gene that performs a similar function in species from all kingdoms. What does this one gene encode?
A) Taq polymerase B) ribosomal RNA C) enzymes needed for photosynthesis D) restriction enzymes
How do mosses help prevent soil erosion?
a. Mosses absorb the majority of running water. b. Mosses have no role in soil formation or erosion. c. Mosses provide an additional habitat to soil organisms. d. Mosses have roots that create a lattice beneath the soil. e. Mosses are packed in dense colonies, holding soil together