Most ulcers are caused by
a. eating spicy food.
b. overuse of aspirin.
c. bacterial infection.
d. stress.
e. poor diet
C
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Peroxisomes
A) are not derived from the endoplasmic reticulum. B) are bounded by double membranes. C) possess acid phosphatase activity. D) possess amylase activity. E) all of the above
What is the correct order of steps during development?
a. Fertilization - cleavage - gastrulation b. Fertilization - gastrulation - cleavage c. Fertilization - differentiation - cleavage d. Gastrulation - fertilization - cleavage e. Cleavage - fertilization - gastrulation
Which is a density-independent factor?
a. competition b. predation c. earthquakes d. parasitism e. disease
A scientist who studies the role of microorganisms in the environment is a(n) .
a. genetic technologist b. earth microbiologist c. epidemiologist d. environmental microbiologist