Land plants, or embryophytes, evolved from

__________, a kind of green algae. Fill in the blank(s) with the appropriate word(s).


Answer: charophytes

Biology & Microbiology

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The direction of expansion for a plant cell is determined primarily by ____

a. location of the cell plate b. the direction of cell division c. the direction to the nearest meristem d. orientation of cellulose microfibrils e. gravity

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Each chromosome has one or more ________ site(s) where replication begins.

A. bifurcate B. promoter C. origin D. replicon

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Humans use about ________ of their daily calories to maintain brain cells and power other life-sustaining activities

A) 25% B) 50% C) 75% D) 90%

Biology & Microbiology

Bacteria that live around deep-sea hot-water vents obtain energy by oxidizing inorganic hydrogen sulfide belched out by the vents. They use this energy to build organic molecules from carbon obtained from the carbon dioxide in the seawater. These bacteria are _________.

A. chemoautotrophs B. chemoheterotrophs C. photoautotrophs D. photoheterotrophs

Biology & Microbiology