The use of arsenic compound Salvarsan as a treatment for syphilis is credited to

A. Ehrlich.
B. Waksman.
C. Chain.
D. Fleming.


Answer: A

Biology & Microbiology

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In sponges, the choanocytes or collar cells

a. are found scattered throughout the sponge body. b. act in obtaining food for the sponge. c. allow exit of water from the sponge. d. produce spicules made of silica or calcium carbonate. e. give rise to gametes.

Biology & Microbiology

Which of the following is NOT directly

required for successful reproduction?

a. ovary b. oviduct c. clitoris d. vagina e. uterus

Biology & Microbiology

The initial importance of a membrane enclosing self-replicating RNA molecules and associated proteins was that a membrane

a. maintained these molecules as a unit capable of reproduction and evolution. b. provided sites for proteins to function. c. transported materials in and out of the compartment. d. kept other molecules out of the compartment.

Biology & Microbiology

The main characteristic that distinguishes a eukaryotic cell from a prokaryotic cell is a cell wall.

Indicate whether the statement is true or false.

Biology & Microbiology