Scientists Believe Polysaccharides Played Little Role,if Any,in Chemical Evolution

question 24

Multiple Choice

Scientists believe polysaccharides played little role,if any,in chemical evolution.Which of the following is not true of polysaccharides,leading scientists to discount them as the first life-forms?

• A)They are incapable of catalyzing chemical reactions.
• B)Because there is no complementary pairing between monosaccharides,they cannot provide the information for copying themselves.
• C)The formation of glycosidic linkages between monosaccharides has been observed only with complex enzymes that would have come after chemical evolution-during biological evolution.
• D)Polysaccharides are polymers,meaning they contain many monomer subunits.Polymers have never been observed to form,in any type of molecule,under laboratory conditions.

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Definitions:

Tarsal Plate

A thick, fibrous layer of connective tissue that forms the supporting structure for the eyelid.

Levator Palpebrae Superioris

A muscle in the orbit that elevates the upper eyelid.

Connective Tissue

Type of biological tissue that supports, connects, or separates different types of tissues and organs in the body, consisting of cells embedded in an extracellular matrix.

Orbicularis Oculi

A muscle surrounding the eye, responsible for closing the eyelids and enabling blinking and winking.