Answer: B) cyclin and cyclin - dependant kinase (CDK)
Explanation: MPF also known as mitosis promoting factor is the cyclin-CDK complex, It stimulates the mitotic and meiotic phases of the cell cycle. MPF promotes the entrance into mitosis (the M phase) from the G2 phase by phosphorylating multiple proteins needed during mitosis. MPF is activated at the end of G2 by a phosphatase, which removes an inhibitory phosphate group added earlier during the cycle.
MPF is composed of two subunits:
Cyclin-dependent kinase 1 (CDK1), the cyclin-dependent kinase subunit uses ATP to phosphorylate specific serine and threonine residues of target proteins.
Cyclin is a regulatory subunit. The cyclins helps to regulate the function of the kinase subunit with the appropriate substrate. The mitotic cyclins can be grouped as cyclins A & B. These cyclins have 9 residue sequence in the N-terminal region called the “destruction box”, which can be recognized by the ubiquitin ligase enzyme which destroys the cyclins when appropriate.
They both contain their own ribosomes. They grow independently and reproduce independently from the cell.
1. Organism
2. Population
3. Community
4. Ecosystem
5. Biome
6. Biosphere
Because scientist found another criteria for classifying organisms such as their DNA composition
Evidences that Taxonomy uses to group or categorizes species range from <span><span>
1. </span>"Fossil Records</span> <span><span>
2. </span>Comparative anatomy</span> <span><span>
3. </span>Comparative embryology</span>
4. Biochemical information <span><span>
5. </span>Cellular structure</span> <span><span>
6. </span>Behavior</span>"
<span>We also suggest that taxonomy has played various roles mainly in many aspects in Zoology, Botany, Anatomy and Physiology –aspects that include animal and human structures and functions. As the biotic community is so diverse it is classified to Biodiversity and the existence of properly assorting by set standard. </span>
Answer:
C. carbon, hydrogen, and oxygen