Bio 1

Starch is composed of amylose and amylopectin, which are unbranched and branched chains of α-glucose subunits, respectively.

True

There are many similarities between DNA and RNA. What statements support this idea?

Both DNA and RNA nucleotides contain the nitrogenous bases adenine, cytosine, and guanine. Both DNA and RNA nucleotides contain the nitrogenous bases adenine, cytosine, and guanine. Both DNA and RNA are involved in the "Central Dogma" of biology. Both DNA and RNA contain phosphate groups on their respective nucleotides.

Cellulose is composed of a long, branched chain of β-glucose subunits.

False

Cellulose is the main storage polysaccharide in plants while glycogen is an important storage polysaccharide in many animals.

False

Like amylopectin, glycogen is insoluble in water, but it has a longer average chain length and fewer branches.

False

Polysaccharides are long polymers made of many nucleotides that have been joined through dehydration synthesis.

False

The principal structural polysaccharide in plants is starch.

False

The starch-hydrolyzing enzymes produced by most organisms cannot break the bond between two α -glucose subunits because they only recognize β linkages.

False

Chitin is a structural polysaccharide found in the exoskeleton of arthropods and the cell wall of many fungi.

True

Complimentary base pairing across the double helix allows information to be transferred via RNA transcription and DNA replication

True

Doubled-stranded DNA consists of two antiparallel strands, meaning that one strand is oriented in the 5' to 3' direction, while the other is oriented in the 3' to 5' direction.

True

Although some polysaccharides are used to store energy, others serve as structural material for cells.

True

Asymmetrical spacing of the backbones of the DNA double helix generates major and minor grooves.

True

Both starch and glycogen are composed of α-glucose subunits.

True

The correct structure of DNA nucleotides can be presented as

phosphate-sugar-base.