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zimovet [89]
3 years ago
8

Ozone is both helpful and harmful to life on Earth. true or false

Biology
1 answer:
trasher [3.6K]3 years ago
4 0
True.

In the upper layers of the atmosphere, it blocks UV radiation from the sun; however, in the lower layers, it is a pollutant. 
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The physical property associated with fractional distillation is
PolarNik [594]

Answer: B boiling point

Explanation: To determine the mixture what given component is separated out from the mixture by its boiling point.

4 0
3 years ago
Meiosis does PMAT twice! That means there is a prophase I and a prophase II. There is a metaphase I and a metaphase II. Etc… If
AURORKA [14]

Answer:

If there is homologous chromosomes (metaphase I) or duplicated chromosomes/sister chromatids (metaphase II) in the middle of the cell.

Explanation:

Meiosis involves two series of nuclear divisions grouped into meiosis I and meiosis II. Each division has the same number of stages i.e prophase, metaphase, anaphase, telophase etc. Meiosis I involves the separation of homologous chromosomes i.e similar but non-identical chromosomes from each parent.

On the other hand, meiosis II involves the separation of sister chromatids (duplicated chromosome). Since METAPHASE is generally characterized by the alignment of chromosome at the middle of the cell for separation in the anaphase stage, it means that the difference between metaphase in meiosis I and II will be whether it is homologous chromosomes that are in the middle or sister chromatids.

Therefore, according to this question, I would know if the cartoon is in metaphase I or II if:

- there are homologous chromosomes in the middle of the cell (metaphase I)

- there are sister chromatids in the middle of the cell (metaphase II).

4 0
3 years ago
Read 2 more answers
Which component cannot be part of this strand?
Irina18 [472]
A- uracil, test prep question
4 0
3 years ago
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If all 5' and 3' splice sites were always used to process the pre-mRNA into mRNA, how many possible distinct mRNA sequences woul
lord [1]

The question lacks the diagram. The diagram has been attached below.

Answer:

1.

Explanation:

Exons may be defined as the coding region of the RNA whereas introns are the non coding region of the RNA. The introns must be removed out from the RNA to makes it functional molecule.

The splicing of the given molecule results in the formation of single mRNA. The 1 splicing of the introns remove intron A whereas the second splicing results in the removal of intron B. The functional mRNA consists of the mRNA with exon 1,2 and 3.

Thus, the answer is 1.

6 0
3 years ago
Please I urgently need help with this
Paul [167]

Answer:

A - Stigma

B - Anther

C - Filament

D -  Style

E - Ovary

F - Petal

Explanation:

The above are the correct answers of the image drawn in the attachment.

These are parts of a flower.

A - Stigma: It is the head of the pistil. It contains a sticky substance that catches pollen grains from other pollinators.

B - Anther: This is the head of the stamen. It produces pollen grain.

C - Filament: It is a long slender part of the flower. It attaches the anther to the flower.

D -  Style: It actually holds the stigma.

E - Ovary: It holds the ovule. Found at the base of the pistil.

F - Petal: It attracts pollinators to the flower.

8 0
3 years ago
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