A scientist is examining motile protozoa. He wishes to determine their direction of movement. Which of the following microscopic techniques is least likely to be used to view these cells?
A) light microscopy
B) electron microscopy
C) differential interference contrast microscopy
D) fluorescence microscopy
E) phase-contrast microscopy
B) electron microscopy
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Which second intermediate host ingests the cercariae of Clonorchis and Opisthorchis?
a. Snail b. Crustacean c. Copepod d. Freshwater fish
Yeast research with autonomously replicating sequences (ARS), along with digestion of chromatin with DNase I, have led scientists to determine that
A) DNA is not protected inside a nucleosome. B) ARSs are really plasmids. C) ARSs bond irreversibly to replication enzymes. D) origins of replication are accessible regions of DNA devoid of nucleosomes.
Cells of the outer surface of a sponge obtain nutrients
by a. absorbing food that diffuses from the central cavity. b. capturing food in their microvilli. c. absorbing food distributed by amoeboid cells. d. phagocytosing bacteria and other small food items. e. poisoning small fish that contact them
Selective permeability of the cell membrane is controlled by
a. kinetic energy. b. lipids. c. proteins. d. lipids and proteins. e. electrolytes.