DNA helicase - unzips the DNA double helix
DNA Polymerase - edits genes to ensure there are no errors, a 'proofreading system'.
DNA ligase - joins all the DNA together
Answer:
What is sleep...
if it's edible sign me up!
Answer:
Polysaccharides.
Explanation:
Polysaccharides are formed by several monoasaccharides units linked by glycosidic bonds.
Completed Q.
There is an island in the middle of a large river that houses a large population of ants. Damming of the river causes the island to flood and only the highest points of the island are now above water. The ants cannot swim, so are now in multiple isolated populations. Which of the following best describes this event?
A. isolation by dispersal
B. isolation by vicariance
C. a form of sympatric speciation
D. only a rare development of polyploidy could lead to speciation in this case
E. speciation will not occur in this case because of gene flow
Answer
B. isolation by vicariance
Explanation:
The ant population was separated by an external factor which leads to habitat fragmentation. And the resulted disjoined distribution of ( ants) ended up in different isolated population. Since ants from their new habitats can not cross to other isolated habitats; and the ant population did not move out of the habitat on their own to from an isolated population but the new habitat was due to fragmentation by natural occurrence( flooding) and not by movements of the ants by themselves Then t is isolation by vicariance.
Therefore option B is the answer.
However if these ants can cross from one isolated habitat to another it will be isolated by dispersal. so B is the answer.
Answer:
The difference in function and properties of polysaccharides such as starch, glycogen, celluose and chitin is due to the differences in their recurring monosaccharide units, the types of bonds linking these units and the degree of branching in the molecules.
Explanation:
Polysaccharides are large molecules of carbohydrates which are made up of recurring monosaccharide units. Examples of polysaccharides are starch, cellulose, glycogen and chitin. Each of these polysacccharides show differences in structure, properties and function. The difference in function and properties of polysaccharides such as starch, glycogen, celluose and chitin is due to the differences in their recurring monosaccharide units, the types of bonds linking these units and the degree of branching in the molecules.
Starch is the storage carbohydrate in plants and is composed of two types of glucose polymers, amylose and amylopectin. Amylose is composed of unbranched chains of D-glucose units linked to each other by (α1→4) glycosidic bonds. Amylopectin is a branched glucose polymer linked to each other by (α1→4) glycosidic bonds and (α1→6) at the branching points.
Glycogen is the storage polysaccharide in animals which is highly branched and compact. It is composed of (α1→4) linked glucose subunits with (α1→6) at the branching points.
Cellulose is a fibrous, tough and water-insoluble substance found in plant cellwalls. It is is a linear unbranched polysaccharide made up of D-glucose units linked together by (β1→4) glycosidic bonds.
Chitin is is the main component of the exoskeletons of athropods. It is a linear molecule composed of N-acetylglucosamine units linked together by (β1→4) glycosidic bonds.