Most ulcers are caused by

a. eating spicy food.
b. overuse of aspirin.
c. bacterial infection.
d. stress.
e. poor diet


C

Biology & Microbiology

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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

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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

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Which is a density-independent factor?

a. competition b. predation c. earthquakes d. parasitism e. disease

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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

Biology & Microbiology