A new DNA strand elongates only in the 5' to 3' direction because _____.

Biology

1 answer:

goldenfox [79]3 years ago

6 0

Answer:

d. DNA polymerase begins adding nucleotides at the 5' end of the template

Explanation:

Polymerase DNA always works in one direction, synthesizing the new 5' to 3' oriented chains and adding nucleotides to the 3' end of a new synthesis chain by forming phosphodiester bonds between the phosphate of a nucleotide and the sugar of the anterior nucleotide.

Because DNA polymerase only acts in a 5' to 3' direction, replication along a chain, the leading chain, occurs continuously. The synthesis of the opposite chain, the delayed chain, occurs discontinuously because the DNA polymerase must wait for the replication fork to open. Over the delayed chain, short segments of DNA called Okazaki fragments (named after Reiji and Tsuneko Okazaki, the scientists who discovered these fragments) are synthesized as polymerase DNA works out of the replication fork. Ligase DNA catalyzes the covalent bonds between Okazaki fragments in the delayed chain to ensure there are no gaps in the phosphodiester skeleton. Finally, the first ones are removed and these gaps are filled by the DNA polymerase.

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What group of animals has flexible hands and feet, large brains in relation to body size, forward-looking eyes, and arms that ca

Lana71 [14]

<h2>Primates </h2>

Explanation:

Primates are a group of animals has flexible hands and feet, large brains in relation to body size, forward-looking eyes, and arms that can rotate in a circle around the shoulder joint

Primates include the lemurs,lorises,monkeys,apes and humans
The order Primates, with its 300 or more species, is the third most diverse order of mammals, after rodents and bats
The Primates order is divided informally into three main groups: prosimians, monkeys of the New World, and monkeys and apes of the Old World
All primates have five fingers (pentadactyly), a generalized dental pattern, and a primitive body plan
Another distinguishing feature of primates is fingernails
Opposing thumbs are also a characteristic primate feature
When compared with body weight, the primate brain is larger than that of other terrestrial mammals, and it has a fissure unique to primates that separates the first and second visual areas on each side of the brain
The eyes face forward in all primates so that the eyes visual fields overlap
Fossils of the earliest primates date to the Early Eocene Epoch (56 million to 40 million years ago) or perhaps to the Late Paleocene Epoch (59 million to 56 million years ago)