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ExtremeBDS [4]
3 years ago
5

PLEASE HELP!!!

Biology
1 answer:
VikaD [51]3 years ago
5 0
The answer is A: Mass extinction.

"Abrupt disappearance of many land and marine species" = extinction of many species.


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In your own words, what is the definition for Chitin?<br><br> what purpose does chitin serve?
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Answer:

Chitin is a fibrous material made up of polysaccharides that is found in the exoskeletons of arthropods and the cell walls of fungus. Chitin is an important biopolymer found in nature. Fungi, arthropods, and nematodes are the principal producers. In insects, it acts as a scaffold, supporting the epidermis and trachea cuticles, as well as the peritrophic matrices that line the gut epithelium.

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4. What technique would a scientist use to produce many copies of a<br> desired piece of DNA?||
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They can use a technique called Polymerase Chain Reaction. This can be done in a test tube or even in a organism. It usually relies on something called  Thermostable DNA Polymerase and Taq polymerase. It requires DNA primers that is designed specifically for that DNA region (interest).

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The tibialis posterior muscle originates at which three locations? The tibialis posterior muscle originates at which three locat
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Tibia, Fibula, Interosseous Membrane.

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What is the function of a muscle cell?
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Producing a contraction that changes both the length and the shape of the cell
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Lysine

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lysine residues on the histone tails of the octamer cn be activated by both acetylation and methylation patterns to influence accessibility or silencing of the genes respectiviely. for example, acetylation of H3K27 (histone 3 lysine residue 27) brings about a region of active chromatin allowing access to transcription activity while its trimethylation  will cause silencing of the associated gene at that particular area (no expression of that gene)

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