What is the Cas9 enxyme used for?

Biology

1 answer:

frez [133]4 years ago

7 0

Answer:

RNA

Explanation:

CRISPR system was discovered by a Japanese scientist. Naturally bacteria and many other prokaryotes have CRISPR system in their genome which they use as a self defense against a pathogen which is invading them. It consists of inter spaced, short palindromic nucleotide repeats which encode a guide RNA (gRNA). This guide RNA (gRNA) recognizes the target sequence on the pathogen. The gRNA is followed by Cas9 enzyme which along with the gRNA plays a very important role in breaking genome of the pathogen. Once the target gene is cut down the rest of the DNA can be rejoined by non homologous end joining.

But nowadays, scientists are using this system for genome editing and incorporating desired gene between the two ends which are cut down by CRISPR Cas9 system.

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Obsidians glassy texture indicates that it formed

OleMash [197]

Answer:

on the surface rapidly

Explanation:

Obsidian glassy texture indicates that the rock formed on the surface rapidly.

Like every other magma, the condition of the environment determines how the magma cools and solidifies.

When magma cools rapidly, nucleation centers will be difficult to come- by ..
At nucleation centers, minerals aggregates and grows to form different grain sizes.
When rapid cooling occurs, not enough time is given for the aggregation around the nucleus.
This leaves a rock mass that is finely grained.

3 0

3 years ago

What is the name of the first international agreement on climate change?

7nadin3 [17]

Answer: Option D."Kyoto Protocol"

Explanation:

The Kyoto Protocol is the first international agreement on climate change that was originated in Kyoto (Japan) on December 11, 1997 and entered into force on February 16, 2005.

Kyoto Protocol was linked to the United Nations Framework Convention on Climate Change, that allows the commitment of parties to reduce gas emission.

In the first commitment period, the community was binded to reduce green house gas emissions to an average of five percent in comparison to 1990 levels. In the second commitment period, parties binded to reduce green house gas emissions to an average of 18 percent below 1990 levels in the eight-year period from 2013 to 2020.

Hence, the correct option is D.

4 0

4 years ago

What happens to a stimulus after the body receives it?

deff fn [24]

When a stimulus is produced it signifies the production of sensation in the sensory organs. This sensation through the sensory organs (eyes, ears, nose, skin and tongue) is sent to the sensory nerve connected to these sense organs. These sensory nerves send nerve impulses through the nerve fiber to the spinal cord. From the spinal cord the nerve impulse is transferred to motor nerves.

The motor nerve then sends response to the stimulus though the same path to the region from which stimulus was received and thus the body responds through muscular activity. Such as removal of heat from the heated object if heated sensations were received.

3 0

4 years ago

Mangroves are a keystone species. True or false?<br> (wut is a mangrove?? )

Veronika [31]

A mangrove is a tree or shrub that grow in tropical coastal swaps and mangroves are keystone species. Because crabs is one of them

7 0

3 years ago

Dead and decaying organic matter, including waste products, is called:

agasfer [191]

Decaying matter is called compost

3 0

3 years ago