Biology, 23.11.2019 07:31 lillyd2873

Which features are associated with flight?

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The ancestors of birds were most likely arboreal.

Having gliding surfaces is advantageous in arboreal animals because it means less likelihood of dying due to a fall. You'll notice that plenty of arboreal animals today have gliding surfaces.

In the ancestors of birds, the gliding surface just happened to stretch from the "fingers" down to the body, setting up for control of the glide, and for further refinement with elongation of the fingers and arms. With this, the animals were not just saving their lives when falling, they could glide from one tree to another to look for food.

A similar process likely happened in the ancestors of bats.

Don't ask me about pterosaurs or insects, 'cause I don't know.

Answer from: Quest

you are certainly talking about this picture:

a: is the label of the white square, it is showing the replication fork, formed by helicase (d) ==> so it is the site of dna separation and replication

b: is a new dna brand that is following directly the replication fork, so it is continuous ==> built continuously from 5' to 3

c: dna polymerase cannot replicate dna on its own, it needs the of their proteins, and one of them plays the role of a clamp which fixes the dna with the dna template and increases the processivity of the enzyme. ==> stops polymerase from falling off the template.

d: is the enzyme responsible for forming the replication fork (helicase) ==> unwinds and separates dna into two strands

e: is the delayed strand, it is built in the opposite sense of the helicase, so dna will be built in fragments ==> built fragments from 5' to 3 joins

and finally f: is the enzyme that builds the new dna strand (dna polymerase) ==> adds nucleotides to make a new dna helix.

credit: gradman555p98x9p

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