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krok68 [10]
2 years ago
11

Histone modification: is fixed; once a histone is modified, it stays that way and the genes with which it is associated are turn

ed on or off permanently. is random and independent of the environment or cell type. is fixed, but this has no effect on whether genes are expressed. can change over time in response to environmental cues, allowing genes to be turned on or off as needed. can change over time in response to environmental cues, but this has no effect on gene expression.
Biology
1 answer:
lana [24]2 years ago
7 0

Answer:

The correct answer is ''can change over time in response to environmental cues, allowing genes to be turned on or off as needed.''

Explanation:

Histones are a family of proteins involved in compacting DNA into structural units called nucleosomes. Histone modifications occur in response to environmental conditions, and modulate the structure of chromatin, that is, they alter the structure of nucleosomes and therefore chromatin, and thus activate the transcription process, in which the chromatin is in the euchromatin state (loose conformation, in which the DNA information can be read), or "off" state, in which the chromatin adopts the heterochromatin conformation (compact conformation, which prevents reading), respectively. These post-translational modifications are mainly acetylation, methylation, phosphorylation, although there are many others. These make up the “histone code” that can change the expression pattern of some genes by modifying the chromatin structure, activating or silencing these genes.

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Blood flow
horrorfan [7]

Answer:

D. Tricuspid → right ventricle → pulmonary valve → pulmonary circulation

Explanation:

The circulatory system is the system of organs and blood vessels which is associated with the circulation of the blood in the body.

The circulatory system is divided into two portions: the systemic circulatory system (body) and the pulmonary circulatory system (lungs).

The vena cava brings the oxygen-poor blood from the body to the right atrium from where the blood is transferred to the same side of the ventricle controlled by the tricuspid valve (atrioventricular valve).

From the right ventricle, the blood is pumped to the pulmonary artery which transports the blood to the lungs where the oxygen will be exchanged.

Thus, Option-D is correct.

4 0
3 years ago
Steady slate what the human body strives to maintain
mestny [16]
The human body strives to maintain homeostasis, the state of balance between internal and external change.
4 0
3 years ago
What are the characteristics of the subatomic particle whose mass is 1/1840 of the mass of hydrogen (H)?
BartSMP [9]
They are positively and negatively charged
3 0
3 years ago
From a large-scale screen of many plants of Collinsia grandiflora, a plant with three cotyledons was discovered (normally, there
Aleksandr-060686 [28]

Answer:

The cross is as follows:

P: D/d × d/d

Explanation:

Half of the F1 progeny are mutant. The mutation results in 3 cotyledons is dominant and the original mutant is heterozygous.

If D denotes the mutant allele and d denotes the wild type allele.

The cross is as follows:

P: D/d × d/d

F1 denotes D/d three cotyledons

d/d denote two cotyledons

3 0
3 years ago
What is the answer help !!!!!!
Phoenix [80]

you are correct, it would be D. i hope this helps you out!

3 0
3 years ago
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