HeLa cells can vary in chromosome number. This panel of chromosomes shows all of the chromosomes in a single metaphase HeLa cell. Which chromosome number has a normal number of copies?

4

Biology & Microbiology

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Of the following lipids, which is found in approximately equal amounts in both the outer and inner portions of the lipid bilayer?

A) cholesterol B) glycolipid C) phosphatidylserine D) phophatidylethanolamine E) phophatidylinositol

Biology & Microbiology

The most widely accepted and supported model that explains the movement of phloem sap in

flowering plants is the ____ mechanism.

a. cohesion-tension b. translocation c. pressure flow d. osmosis e. transpiration

Biology & Microbiology

When oxygen became part of the atmosphere, it came from 

A. carbon dioxide. B. volcanoes. C. the splitting of water by autotrophs. D. organic molecules.

Biology & Microbiology

The law of segregation states all of the following except

a. factors separate during formation of the gametes. b. each individual has two factors for each trait. c. gametes contain a single factor for each trait. d. factors assort independently of each other by meiosis.

Biology & Microbiology