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kvasek [131]
3 years ago
12

A substance that enters Earth's cycles and does harm to living things is

Biology
2 answers:
hammer [34]3 years ago
7 0

A substance that enters Earth's cycles and does harm to living things is a pollutant.


kicyunya [14]3 years ago
3 0
The answer is C: a pollutant.
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which piece of DNA would have the highest tm one with a cytosine plus guanine comment at t 30% or a cystonie plus guane content
erik [133]

Answer:

50% G+C will have a higher Tm

Explanation:

The Temperature of Melting (Tm) refers to the temperature at which 50% of double-stranded DNA (dsDNA) is changed to single-standard DNA (ssDNA). In the double helix of DNA, Adenine bases always pair with Thymine bases through two hydrogen bonds, whereas Guanine bases always pair with Cytosine bases through three hydrogen bonds. In consequence, a DNA molecule containing a higher GC content is more stable than another DNA molecule containing a lower GC content. The Tm can be calculated as follows = 2 °C(A + T) + 4 °C(G + C) = °C Tm (this equation is useful for oligonucleotides of 14 to 20 base-length).

6 0
2 years ago
If a cell has a diploid number of 8 (2n = 8) before meiosis, how many chromosomes will be in each of the four daughter cells aft
Naddik [55]

Answer:

The final product is four gametes, two of them with 5 chromosomes, and the other two with 3 chromosomes each.

Explanation:

If nondisjunction occurs during meiosis 1, a pair of homologous chromosomes fail to separate, and one of the daughter cells will have the two chromosomes while the other cell will not get any chromosome from the pair.

If meiosis 1 occurs normally, but nondisjunction occurs in meiosis 2, sister chromatids fail to separate.  

The usual process of meiosis produces four daughter haploid cells (n) from a diploid germ cell (2n). Each daughter cell is haploid because they have half the number of chromosomes of the original one.  

If the diploid number of the original cell is 8 (2n=8), then under normal conditions, each haploid daughter cell should have 4 chromosomes (n = 4).  

But in the exposed example, one pair of homologous chromosomes experiences nondisjunction during meiosis I (in the attached file, you will recognize this pair as the red one). The other chromosomes separate as usual. So one of the daughter cells will have one extra chromosome than expected (five instead of four), and the other daughter cell will lack one chromosome (three instead of four). Meiosis II occurs normally. The final result is the formation of four gametes, two of them with 5 chromosomes, and the other two with 3 chromosomes each.

6 0
2 years ago
Taxol is a drug that stabilizes microtubules and prevents them from depolymerizing. Consequently, cells treated with taxol fail
DanielleElmas [232]
The last stage of mitosis would be telophase.
7 0
3 years ago
Distinguish between innate and acquired immunity
mote1985 [20]

Answer:

Innate immunity you are born with.

Acquired immunity you need to work on over time

Explanation:

Poison ivy for example. Come people are born immune to it, while others have to be around it a lot, (agonizingly so), and they will build up immunity to it's poison.

5 0
3 years ago
Fluid taken in by the ureter
Kitty [74]

Answer:

that fluid is transported to the urinary bladder then later expel via the urethra

6 0
3 years ago
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