Answer:
A nucleotide is the basic building block of nucleic acids. RNA and DNA are polymers made of long chains of nucleotides. A nucleotide consists of a sugar molecule (either ribose in RNA or deoxyribose in DNA) attached to a phosphate group and a nitrogen-containing base. The bases used in DNA are adenine (A), cytosine (C), guanine (G), and thymine (T). In RNA, the base uracil (U) takes the place of thymine.
Answer:A) Phytoplankton are classified..
B) Arctic Cod have multiple...
C) Polar bears and Arctic birds...
Explanation:
I just did these on Usatestprep:)
Answer:
"Dred Scott case: the Supreme Court decision. The court also declared the 1820 Missouri Compromise unconstitutional, thus permiting slavery in all of the country's territories. The case before the court was that of Dred Scott v. Sanford. Dred Scott, a slave who had lived in the free state of Illinois and the free territory..."
Explanation:
1. Supplying oxygen to cell and tissue
2. Providing nutrients to cells
3. Protecting your body from infections
The correct answer is: contractile vacuoles.
Paramecium is simple unicellular ciliate that lives in the water environments. It is often used as model organism in laboratory experiments because of its ability to easy conjugate and divide.
Osmoregulation of the paramecium is regulated by contractile vacuoles (one or more within the cell). Contractile vacuoles expel water from the cell in order to compensate for fluid absorbed by osmosis from its water surroundings.
