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Svetlanka [38]
3 years ago
11

What number of President was Andrew Johnson

Biology
1 answer:
Bad White [126]3 years ago
6 0

A quick Google search revealed that Andrew Johnson was the 17th president of the United States.

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Researchers noted that when a lysine residue on a histone is acetylated, its side chain becomes neutral in charge. Combined with
lesantik [10]

Answer:

The correct answer is A) Histone deacetylation generally decreases gene expression.

Explanation:

Histones are the proteins that are responsible for the condensation of chromatin, which is directly linked to the capacity that a gene has to be expressed. The more condensed a gene is, the less expressible it becomes.

In order to regulate the gene expression, histones can suffer from many modifications that can change their conformation and the expressiveness of specific genes.

<u>Histone acetylation is linked with an increase of gene expression; while deacetylation and methylation decrease gene expression.</u>

3 0
3 years ago
Arrange the three kinds of nitrogenous wastes based on the energy required to synthesize them, beginning with the waste product
Evgen [1.6K]

the three kinds of nitrogenous wastes based on the energy required to synthesize them are arranged; Ammonia < urea < uric acid.

Nitrogenous wastes are the nitrogen compounds that organisms use to get rid of excess nitrogen. Ammonia, urea, and uric acid are the most common nitrogenous wastes that animals excrete. Protein metabolism generates all of these nitrogenous wastes.

Ammonia is the most toxic of these nitrogenous wastes, and it is the most common but requires the least energy. Urea is more harmful than uric acid, but it is less harmful than ammonia, reducing the amount of energy required to synthesize it. Uric acid is the least harmful, a non-poisonous particle with four nitrogen molecules. This is useful for birds and reptiles that lay hard eggs because it eliminates the most nitrogen, uses the least amount of water, and is not toxic. It also takes the most energy input.

Know more about urea here: brainly.com/question/14453829

#SPJ4

3 0
1 year ago
In cardiac muscle In cardiac muscle an action potential spreads throughout the Z discs. intercalated discs connect the muscle fi
Anastasy [175]

In cardiac muscle

a. an action potential spreads throughout the Z discs.

b. intercalated discs connect the muscle fibers together.

c. calcium enters the cell from storage chambers called intercalated discs.

d. potassium is released from the sarcoplasmic reticulum

Answer:

b. intercalated discs connect the muscle fibers together.

Explanation:

Intercalated discs are components of the muscles found in the heart(cardiac muscles).

Intercalated discs join the cardiomyoctes (muscle cells or fibers) together so that they can function as one and transmit signals amongst themselves during the contraction of the heart.

Intercalated discs are made of up desmosomes and gap junctions.

Intercalated discs are found on the lining of the sacromere and can only be seen by using a microscope to observe the longitudinal section of the heart tissue.

7 0
2 years ago
Read 2 more answers
What adaptations allow plants to live in areas with little rainfall?
julsineya [31]
Adaptions to collect and retain water - thick, non-pourous stems, not leaves, but thick lobes and the ability to store water until its needed.
7 0
3 years ago
3. What body movements are due to muscles working in opposed<br> groups? Explain
NikAS [45]

Answer:

Elbow

Explanation:

Muscle works in pairs and groups e.g biceps flexes the elbow and triceps extend it and it is called antagonistic muscle action.

The working muscle is called the primer mover or agonist. The relaxing muscle by another muscle is called synergists.

When muscles cause a limb to move through the joint range of motion,it could be synergists or antagonists.

I hope this will help you

6 0
3 years ago
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