Who was the first person to describe living single cells?

A) Leeuwenhoek
B) Hooke
C) Schleiden
D) Schwann
E) Virchow


Ans: A) Leeuwenhoek

Biology & Microbiology

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A protozoan cyst differs from a helminth egg in that

A. the chromosome is free in the cytoplasm of a cyst, but enclosed in a nucleus in an egg. B. a cyst is metabolically active, but an egg is not. C. the cyst can germinate to form the organism but the egg must be fertilized. D. cysts have a uniform structure, but eggs have a wide variety of morphologies.

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In order to transfer gene a to an F- cell, the sex pilus must be in place for at least ____ minutes

a. 0 b. 6 c. 10 d. 14 e. 25

Biology & Microbiology

List and define two types of chemical bonds. 

What will be an ideal response?

Biology & Microbiology

In the human pulmonary circuit, blood passes through which of the following?

A. Liver B. Limbs C. Lungs D. Digestive organs E. Brain

Biology & Microbiology