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andrew-mc [135]
3 years ago
11

Which of the following is a sign of poor quality water? (2 points)

Biology
1 answer:
Stella [2.4K]3 years ago
7 0

3. High phosphate content


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Explain how chemicals present in cigarette smoke are able to enter the body and reach the brain
kobusy [5.1K]

When you smoke a cigarette, the components; e.g. nicotine and carbon monoxide enter the lungs and are absorbed into the bloodstream. They are carried by the Red Blood Cells to the blood-brain barrier, here, nicotine binds to nicotinic acetylcholine receptors (nAChRs), resulting to a cascade that results to release of dopamine (good-feeling neurotransmitter).






4 0
3 years ago
you are a biochemist working for a pharmaceutical company. you have been tasked with identifying a sample of nucleic acid. it is
Lorico [155]

The sample that is being discussed in the problem can be either DNA or RNA.

DNA and RNA are both very important molecules. Both of these hold immense value in biology since they store all the vital information required for living. The basic structures of the two are quite similar; the only difference is that DNA is double-stranded while RNA has a single strand.

DNA and RNA molecules both contain a five-carbon sugar (ribose), a phosphate group, and a nitrogenous base. Except for cytosine, guanine, and adenine, the fourth part is the phosphate group that exists in both. RNA has Uracil while DNA has Thymine.

Since it has not been mentioned here what the fourth part might be, the sample might be a DNA or an RNA molecule.

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6 0
1 year ago
What leads to long-term immunity in mammals? . . A. Exposure to an antigen . B. Action of an antibody . C. Barriers
Alborosie
A. <span>Exposure to an antigen

Exposure to viruses and antigens led to the foundation of modern vaccination. Vaccination introduces an antigenic material that helps the ability of the immune system to adapt a specific pathogen, therefore leading to a long-term immunity.</span>
7 0
3 years ago
Read 2 more answers
How are rhizomes involved in asexual reproduction of ferns?
Rasek [7]

Answer:

The sporophytes of ferns grow through the rhizome

Explanation:

The gametophyte are responsible for sexual reproduction in plants while the sporophytes are usually responsible for asexual reproduction in plants.

Sporophytes are found in the rhizomes of plants and they help in the asexual reproduction.

This is how rhizomes are involved in asexual reproduction of ferns

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3 years ago
Which two parts of a plant reproduce, or make, new seeds?
Mamont248 [21]
The stem and the middle of the peatals
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