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N76 [4]
3 years ago
7

DNA sequences can act as "tape measures of evolution". Scientists analyzing the human genome sequence were surprised to find tha

t some of the regions of the human genome that are most highly conserved (similar to comparable regions in other species) don't code for proteins. What is a possible explanation for this observation? EVOLUTION CONNECTION sequences can act as "tape measures of evolution". Scientists analyzing the human genome sequence were surprised to find that some of the regions of the human genome that are most highly conserved (similar to comparable regions in other species) don't code for proteins. What is a possible explanation for this observation?
Biology
1 answer:
jenyasd209 [6]3 years ago
7 0

Answer:

Non-coding DNA regions play important roles in regulating transcriptional activity by encoding different types of non-coding RNAs (ncRNAs), acting as scaffold attachment regions, acting as enhancer specific regions, etc.

Explanation:

Historically, it had been believed that non-coding DNA sequences were 'junk DNA' since they don't encode for proteins (beyond the sequences that are transcribed into functional non-coding RNAs, i.e., transfer RNA and ribosomal RNA). However, in the last years, it has been shown that non-coding DNA sequences play critical roles in regulating gene expression and genome function. For example, evolutionary conserved non-coding RNAs (ncRNAs) with regulatory roles on gene expression such as, for example, long non-coding RNAs (lncRNAs) and microRNAs (miRNAs) have been mapped in non-coding DNA sequences, thereby evidencing the functional significance of these regions. In consequence, the conservative nature of certain non-coding DNA sequences evidence that mutations in such regions may have significant deleterious effects, and thereby they could have a negative impact on the fitness of the individual.

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At the end of microbiology lab, you decide to practice your Gram-staining skills. The teaching assistant has no fresh cultures b
dangina [55]

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Loss of cell wall integrity or

Explanation:

Grams staining i a staining method used to classify bacteria into two main classes. Gram positive and Gram negative.

They are differentiated according to the ability of their cell wall to retain the primary stain color of the crystal violet stain or the counter stain pink.

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3 years ago
Why is the cell cycle important
Brrunno [24]

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Read 2 more answers
When elongated, tube-shaped cells from the lining of the intestine are treated with a certain chemical, the cells sag and become
Andrei [34K]

Answer:

The internal structures disrupted by this chemical are probably VACUOLES.

Explanation:

A vacuole is a large membrane-bound vesicle in a cell's cytoplasm.

The central vacuole of a cell houses the digestive processes which includes chemicals that come to attack the cell; also it helps the cell regulates it's water concentration during changing environmental conditions.

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