There are a lot
First of all, Eukaryotic cells have a true nucleus
and Prokaryotic cells doesnt have a true nucleus. Eukaryotes have membrane bound organelles and Prokaryotes dont have membrane bound organelles.
Most likely the outside atoms that are arranged around the central atom. but you didn't really give any answers. so thats my best guess.
Coronary vessels supply blood to heart muscles ..blockage in them will cause hypoxia in heart muscles which leads to heart attack
Answer:
The enzyme Topoisomerase functions to prevent super-coiling of the DNA molecule during replication.
Explanation:
- During replication, topoisomerases are required to relieve the positive supercoiling that arises from DNA unwiding mediated by Helicases.
- A DNA topoisomerase is a nuclease that breaks a phosphodiester bond in a DNA strand.
- All topoiomereases are classified as Topoisomerase I and Topoisomerase II depending on whether they cleave one or two strands respectively.
- Topoisomerase I do not use ATP as a source of energy, the reaction is powered by energy stored in super-coiled DNA.
- Topoisomerase II also do not require external energy but it utilizes ATP hydrolysis to drive conformation changes in the protein during reaction cycle.
Answer: Option B) is a foreign molecule that evokes a specific response by a lymphocyte
Explanation:
An antigen is a large, foreign molecule (such as a protein) that stimulates the host organism to secrete lymphocytes and specific antibodies that bind to the foreign molecule, labelling it as foreign and destined for destruction.
Thus, option B is the answer
