Paired lungs are characteristic of ____

a. spiders
b. all birds
c. all fishes
d. all amphibian life stages
e. all insects


ANSWER: b

Biology & Microbiology

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At 4:00 p.m. a closed flask of sterile broth is inoculated with 10,000 cells. The lag phase lasts 1 hour. At 9:00 p.m. the log phase culture has a population of 65 million cells. The mean generation time is approximately

A. 10 minutes. B. 40 minutes. C. 20 minutes. D. 30 minutes.

Biology & Microbiology

When a land bridge connecting two continents

is cut off due to rising sea levels, this can lead to

a. sympatric speciation. b. disruptive selection. c. directional selection. d. hybrid sterility. e. allopatric speciation

Biology & Microbiology

According to your text, how many classes of IFs exist?

The proteins of intermediate filaments (IFs) are tissue-specific. Unlike microtubules or microfilaments, the amino acid composition of intermediate filaments varies from tissue to tissue. IFs are classified by the cell type or tissue in which they are found.

Biology & Microbiology

During the cell cycle, DNA replicates during the late G1 phase

Indicate whether the statement is true or false

Biology & Microbiology