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WINSTONCH [101]
3 years ago
15

DNA replication occurs in a cell in all of the following situations, EXCEPT when

Biology
1 answer:
love history [14]3 years ago
6 0
Cells repair damage from UV light
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A researcher has developed two stains for use with seed plants. One stains sporophyte tissue blue; the other stains gametophyte
sukhopar [10]

Answer:

A) The pollen grains will be pure red.

Explanation:

Plants have alternation of generations, this means that there are two different stages in their life-cycle: a sexual haploid (n) phase and an asexual diploid phase (2n). These phases occur in different individuals, so there is an haploid plant called gametophyte that carries gametes and after fecundation, it will rise a diploid sporophyte (asexual).  

In seed plants, the sporophyte is the plant that we normally see, and the gametophyte is reduced into an organ of the sporophyte. The male gametophyte is the pollen that is produced in the sporangium in anthers (parts of sporophyte).  When a pollen grain fecundes a female gametophyte (egg), it will produce a diploid embryo or new sporophyte.

Therefore, if the researcher exposes pollen to both stains, these grain will stain red, because red stain identifies gametophyte tissue.

3 0
3 years ago
Can enzymes be reused
Masja [62]

If denaturation occurs (extreme temperature change or pH changes), the enzyme will not be reusable! The structure of the enzymes are not changed. As a result of this, enzymes will be used again and again to bind onto another substrate molecule and catalyze the reaction once again.

8 0
4 years ago
Where is a meteorite found?<br> 1) in space <br> 2) in earth’s atmosphere <br> 3) hitting the sun
AnnZ [28]

Answer:

In space

Explanation:

Because it would be weird if it would be in earth's atmosphere, and hitting the sun is rare. Most likely to come from space

8 0
3 years ago
Read 2 more answers
which substance is a waste that would normally diffuse across the placenta from the embryo to the mother?
Olenka [21]
That waste product would be carbon dioxide.
3 0
3 years ago
Cross a red flower (AaBB) with a pink flower (AaBb). What are the expected phenotypic ratios of offspring?
defon

Answer:

Cross a red flower (AaBB) with a pink flower (AaBb). What are the expected phenotypic ratios of offspring?

AaBB x AaBb= AABB, AaBb, AaBB, aaBb

Phenotyic ratio is 3:1

Explanation:

6 0
3 years ago
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