The Archaea Are

question 63

Multiple Choice

The Archaea are

• A) primarily ancient organisms that have not evolved very much in the last billion years.
• B) phylogenetically diverse, but functionally restricted to extremophiles and chemolithotrophs.
• C) diverse microorganisms that inhabit almost every environment on Earth, including the colon of humans and other mammals.
• D) functionally diverse, but restricted to thermophilic or hyperthermophilic environments.

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Definitions:

Plasmodesmata

In plants, cytoplasmic connections in the cell wall that connect two adjacent cells.

Protoderm

The outermost layer of cells in the early embryo of plants, which develops into the epidermis.

Ground Meristem

The part of a plant embryo that develops into the ground tissue of the plant, which includes the cortex and pith.

Procambium

A primary meristematic tissue in plants, which differentiates into vascular tissues (xylem and phloem).