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nikklg [1K]
3 years ago
8

A student complains that it makes no sense to worry about coliform bacteria in water, since we naturally possess harmless colifo

rms in our intestines anyway. Why do regulatory agencies worry about coliform bacteria in water supplies, then?
Biology
1 answer:
SVETLANKA909090 [29]3 years ago
5 0

Answer:

Some types of coliform bacteria can cause death if ingested.

Explanation:

We have coliform bacteria as part of our bacterial flora. Most coliform bacteria are not harmful. However, there are some strains such as E. coli (Escherichia coli) that can cause serious diseases. Hemolytic Uremic Syndrome is one of them. Bacteria can be found in contaminated water, poorly washed vegetables and raw meats.

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How does algae reproduce? Select the best answer.
Lynna [10]

b. both sexually and asexually

6 0
2 years ago
Match the following.
valkas [14]

Answer:

1 . The stage on the first meiotic division when the homologous chromosomes move to opposite poles but the sister chromatids remain together

: b. Anaphase I

2 . The stage in the second meiotic division where sister chromatids migrate to opposite poles

: c. Anaphase II

3 . A structure on the chromosome that holds a pair of chromatids together during replication

: f. centromere

4 . A double-stranded chromosome following replication attached by a centromere

: d. chromatid

5 . A condition where non-sister chromatid of homologous chromosomes exchange genes

: e. crossing over

6 . The stage in the first meiotic division where the homologous chromosomes line up as a pair

: a. Metaphase I

7 . The stage in the second meiotic division where the chromatid pair lines up at the equator of the cell: g. Metaphase II

Explanation:

DNA replication occurs during the S phase of the interphase of the cell cycle. The replicated DNA molecules are accommodated in two sister chromatids of a chromosome that are held together by a centromere.  

During prophase I, the chromatids of a homologous chromosome pair exchange a genetic segment. This process is called crossing over. It generates recombinant chromatids with new combinations of genes.

Metaphase I of meiosis I includes the alignment of homologous pairs of chromosomes at the cell's equator. This is followed by separation and movement of homologous chromosomes to the opposite poles of the cell during anaphase I.  

Metaphase II of meiosis II includes the alignment of individual chromosomes, each with two sister chromatids, on the cell's equator. During anaphase II, splitting centromere separates the sister chromatids which then move to the opposite poles of the cell.

3 0
3 years ago
Are viruses alive? The scientific debate continues. Viruses exhibit some characteristics of life, but others are missing.
sveticcg [70]
B they don’t contain any genetic material
8 0
3 years ago
Read 2 more answers
Why do most particles in solar wind not reach Earth’s surface?
Inessa [10]

Answer:

Due to the dense atmosphere

The magnetic field of the earth

Explanation:

Most particles in the solar wind do not reach the earth's surface because the atmosphere is very dense and the protecting magnetic field of the earth.

A solar wind is a burst of energetic particles from the sun which are made up electrons, ions, etc.. They travel at a very high velocity.

  • The magnetic field of the earth is able to deflect these charged particles away.
  • In areas such as the pole, the interact with the atmosphere to produce very stunning auroras.
6 0
3 years ago
Which cellular structures are found in plant cells but NOT in animal cells?
Anestetic [448]
a. chloroplast and cell wall

The chloroplast contains chlorophyll, which is the stuff that makes plants green. So animals do not have a chloroplast. Only plants have a cell wall and it is what helps plants maintain their shape. Hope this helped! :)
4 0
3 years ago
Read 2 more answers
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