Substance that keeps the alveoli open


Answer: surfactant

Biology & Microbiology

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Which of the following is a correct comparison of bacterial and eukaryotic chromosomes?

A. Both have a single replication origin. B. Only eukaryotes have specific sequences necessary for DNA distribution during cell division. C. Eukaryotes usually have circular chromosomes; bacteria have linear. D. Both have multiple replication origins. E. Bacteria have circular chromosomes; eukaryotes have linear.

Biology & Microbiology

Years before Schwann’s pronouncement that a cell

has a life of its own even as a component of a multicellular organism, the cell nucleus had been discovered by a. Robert Hooke. b. Robert Brown. c. Theodor Schwann. d. Rudolf Virchow. e. Anton van Leeuwenhoek.

Biology & Microbiology

In an analysis of a new bacterial species, a microbiologist finds that the bacteria has an outer layer comprised primarily of proteins. This layer of proteins is known as a glycocalyx.

Answer the following statement true (T) or false (F)

Biology & Microbiology

Lysosomes maintain an acidic environment by actively pumping protons into their interior.

Answer the following statement true (T) or false (F)

Biology & Microbiology