Developing Bird Embryos Excrete Most of Their Nitrogenous Waste as Uric

question 29

Multiple Choice

Developing bird embryos excrete most of their nitrogenous waste as uric acid because ________.

• A) it is less metabolically expensive to produce compared to other waste products
• B) it has a low solubility in water and is less toxic to the embryo than other forms of waste
• C) it requires less energy to transport across the egg shell
• D) it can be recycled by the embryo to make new protein

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Definitions:

Actin

One of two major proteins of muscle; makes up thin filaments in myofibrils of muscle fibers. See also myosin.

Myosin

A type of protein found in muscle tissue as a thick filament that plays a key role in muscle contraction and movement.

Sarcolemma

Plasma membrane of a muscle fiber; also forms the tubules of the T system involved in muscular contraction.

Plasma Membrane

The lipid bilayer that surrounds a cell, regulating the passage of substances in and out of the cell.