When does the cell cycle start? when does it end?

Solution:

The cell cycle is continuous because our cells are constantly dying and making new cells.  

It is is made up of:

1 phase: things inside of the cell begin to grow.  

Middle phase: DNA and only the DNA divides  

Last phase: All other organelles divide  

Then finally comes Mitosis which has:  

Prophase: chromosomes condense, centrioles move to opposite poles, nuclear membrane dissolves, spindle begins to form  

Prometaphase: smindles attach to chromosomes (but they are not aligned)  

Metaphase: chromosomes are on the metaphase plate. They are lined in the center.  

Anaphase: spindles pull the sister chromatids apart  

Telophase: everything that happened in phrophase..but the OPPOSITE!  

Thus we get finally is Cytokinisis where the cell divides

hey, i believe your answer would be d. sugar ribose and the base uracil. i believe this is the answer, because rna consists of sugar ribose, adenine, guanine, cytosine, and uracil.

your first option is incorrect, because that's dna. where it consists of sugar deoxyribose, adenine, guanine, cytosine and thymine.

your second option is also incorrect, this is because sugar deoxyribose is in dna, and uracil is in rna. these two do not make sense together.

your third option being incorrect, because sugar ribose is in rna, but not the base of thymine. rna consists of uracil, not thymine.

lastly your fourth option being correct! this answer is correct, because both sugar ribose, and the base uracil are in rna! ~

answer is d. sugar ribose and the base uracil.