In 1665, ________ used a microscope that he had built to examine thin slices of ________. While examining this material, he observed tiny compartments that he called cellulae.

A) Theodor Schwann; animal tissue
B) Robert Hooke; cork
C) Antonie van Leeuwenhoek; sperm cells
D) Robert Brown; plant material
E) Rudolf Virchow; collagen


B) Robert Hooke; cork

Biology & Microbiology

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A population is correctly defined as having which of the following characteristics?

I) inhabiting the same general area II) belonging to the same species III) possessing a constant and uniform density and dispersion A) I only B) III only C) I and II only D) II and III only E) I, II, and III

Biology & Microbiology

Which of the following is not bilaterally symmetric?

a. turbellarian b. lamp shell c. ribbon worm d. phoronid e. comb jelly

Biology & Microbiology

Which of the following is an inflammatory disorder that affects the eyes, skin, liver and intestines?

a. GERD b. hepatitis c. diarrhea d. Crohn’s disease e. diverticulitis

Biology & Microbiology

Dietary fiber

a. raises blood cholesterol levels. b. speeds up transit time for food through the digestive tract. c. causes diverticulosis. d. causes constipation.

Biology & Microbiology