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andreyandreev [35.5K]
3 years ago
7

How and why has the air quality changed in the United States over the last 30 years?

Biology
1 answer:
Mars2501 [29]3 years ago
6 0

Answer:

It has gotten worse.

Explanation:

In the past 30 years, air quality in the United States has declined almost exponentially. Pollution is the main reason for the declination of air quality in the United States, but there are different kinds of pollution, including light pollution, noise pollution, air pollution, water pollution, etc. Air pollution can be caused by primary or secondary pollutants. Primary pollutants include carbon, nitrogen, and sulfur oxides as well as just general particles in the air. Secondary pollutants are formed when pollutants are exposed to sunlight via chemical reactions.

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Which of the following organic molecules may have up to four levels of structure? A. Proteins B. Lipids C. Nucleic Acids D. Carb
masha68 [24]
The correct answer is proteins.

Proteins have four structures; (1) primary, (2) secondary, (3) tertiary, and (4) quaternary. Primary structures of proteins are formation of peptides and the peptide bonds between amino acids. Secondary structures of proteins involves the amino acid composition leading to hydrophobic interactions forming either alpha helices or beta sheets. Interactions between secondary structures of proteins will make the tertiary structure which is either soluble (globular) or insoluble (fibrous) proteins. Quaternary structures are the combination of two or more tertiary structures and these are called subunits.
4 0
3 years ago
a reessive allele on the x chromosome is responsible for red-green color blindness in humans. a woman with normal vision whose f
Ray Of Light [21]

Answer:

50%

Explanation:

Let the allele for red-green color blindness be represented by c.

Normal vision woman whose father is color-blind will be X^CX^c

Color-blind male will be X^cY

X^CX^c   x   X^cY

Progeny: X^CX^c, X^CY, X^cX^c, X^cY (See the attached image)

<em>Out of the 2 male progeny, 1 is affected for color-blindness while the other is not affected. This gives a 50% probability that a son of the couple will be color-blind.</em>

4 0
3 years ago
In order to initiate transcription in eukaryotes, _______. View Available Hint(s) In order to initiate transcription in eukaryot
laila [671]

Answer:

transcription factors bind to the promoter, and RNA polymerase is then recruited to begin transcribing the gene

Explanation:

The transcription process in eukaryotes happens in 3 stages:

  1. Initiation
  2. Elongation
  3. Termination

The initiation of transcription starts when a set of proteins called the transcription binds to the promoter region of a gene on the coding strand of DNA. Thereafter, the RNA polymerase enzyme binds to the promoter region thereby opening up the double helix structure of the DNA in anticipation of transcription.

During elongation, RNA nucleotides are added to the growing RNA strand in 5' to 3' direction with the DNA unwinding and winding back as the polymerase moves along the coding strand in 3' to 5' direction.

Transcription terminates when the RNA polymerase gets to the end of the gene being transcribed signalled by a sequence of DNA known as the terminator.

<em>Hence, in the illustration, the correct answer would be that the transcription factors bind to the promoter, and RNA polymerase is then recruited to begin transcribing the gene.</em>

3 0
2 years ago
The patient is an 85-year old female who presents to the emergency department (ed) with increasing shortness of breath, hypoxia,
Montano1993 [528]

The 85-year old female patient who presents to the emergency department (ed) with increasing shortness of breath, hypoxia, productive cough, and progressive weakness will be assessed and diagnosed by the nurse as someone who is probably having asthma. The mentioned symptoms are common with people who have asthma.

5 0
3 years ago
How does our bodies sometimes act like a thermostat
Andreas93 [3]
We shiver and produce goosebumps to “turn on the heat”, and we sweat to “turn on the cool.” an organism must be able to maintain stable internal conditions in a changing environment
7 0
3 years ago
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