Answer:
c po he he shell fish po sagot
B cells produce antigen
t cell are helper,killer,memory cells
they hold memory of pathogens i the system
Answer:
Hydrogen Bonds
Explanation:
In the polymerase chain reaction (PCR) the temperature rises to 90 ° C - 95 ° C, to break the hydrogen bonds, which are the types of bonds responsible for pairing the two strands of DNA, this process is known as denaturation of DNA.
The DNA is extremely stable, due to a large number of bonds (hydrogen bonds) that form between the two strands. If the temperature decreases, these bonds will begin to recompose, until the DNA returns to its original state
If the question goes like this:
Which best describes plant classification?
<span><span>
A.
</span>Nonvascular plants are grouped into seedless and
seeded plants. </span>
<span><span>
B.
</span> Seedless
plants are grouped into gymnosperms and angiosperms.</span>
<span><span>
C.
</span>Gymnosperms are grouped into monocots and
dicots. </span>
<span><span>
D.
</span> Angiosperms are grouped into monocots and
dicots.</span>
<span>
The best answer
will be letter D. Angiosperms are grouped into monocots and dicots.</span>
Botanists grouped or classified together according to its
characteristics.
see attached file for more information about classification of plants.
Answer:
A. Yes, because the %A approximately equals the %T and the %G approximately equals the %C in both species.
Explanation:
According to Chargaff's rule, in all cellular DNAs, the number of adenosine residues (A) is equal to the number of thymidine residues (T). And the number of guanosine residues (G) is equal to the number of cytidine residues (C). Therefore, the sum of the purine residues equals the sum of the pyrimidine residues (A+ G= C+ T). It is based on the fact that a purine base always pairs with a pyrimidine base in a double helix DNA.
Chargaff’s rule is followed in all the double-helical DNA molecules irrespective of the species. In DNAs of sea urchin and salmon, the percentage of adenine is equal to that of the thymine and the percentage of guanine is equal to that of the cytosine. Therefore, Chargaff's rule is followed.
