Acell has undergone dna replication and the number of chromosomes has doubled. what will happen next?

a. the cell will synthesize all the proteins it needs to divide in two.
b. spindles will form and centrioles will move to the opposite poles.
c. chromosomes line up along the middle.

A. The cell will synthesize all the proteins it needs to divide in two.

Explanation:

Sequence of phases of cell cycle:

Interphase (G1-->S--->G2) > M phase (prophase--->metaphase--->anaphase--->telophase).

DNA replication and duplication of chromosomes occur during S phase of cell cycle. It is followed by G2 phase which is marked by synthesis of proteins needed for M phase and continuous cell growth. Initiation of spindle formation and movement of centriole to opposite poles are the events of prophase that follows G2 phase. Metaphase is the next phase which includes alignment of chromosomes at the cell equator.

The correct answer is A. The cell will synthesize all the proteins it needs to divide in two.

Explanation:

DNA replication takes place in the S phase of the cell cycle which results in doubling of chromosomes. After synthesis phase cell enters the G2 phase in which the cell prepares itself to move into the mitotic phase to divide.

G2 phase nearly lasts for 3-4 hours and cells in this phase continues to grow in size and produce essential proteins which is required in mitosis for the division of a cell into two daughter cells.

It has also a checkpoint called G2 checkpoint which confirms that the cell is ready to move into the mitotic phase or not. Therefore, the right answer is A.  

step 1 ammonium can be absorbed by plants, but some is converted into nitrates which are better for plants to absorb. this is called nitrification. 2. step 2 the deer eats the plants and uses the nitrogen-containing proteins for cell growth. 3. step 3 bacteria in the soil conduct nitrogen fixation to convert nitrogen gas from the atmosphere into ammonium. 4. step 4 some of the nitrates are absorbed back into plants, but denitrification breaks down the nitrates into nitrogen gas released back into the atmosphere. 5. step 5 nitrogen is found in the urine, which gets broken down into ammonium through the process of ammonification. 6. step 6 plants absorb the ammonium and begin assimilation, the process to add the nitrogen to protein.

there are mainly three domains in biological classification namely; archaea, bacteria, and eukarya.

archaea includes all the prokaryotic cells which are characterized by their lipid membranes. they have branched hydrocarbon which is attached to glycerol through an ether linkage.

bacteria includes all the prokaryotic cells, the cell membrane of which are made up of the unbranched fatty acid chain. in addition, they are attached to glycerol through an ester bond.

eukarya includes all the eukaryotic cells, that is, the cells contain a nucleus and other membrane-bound cell organelles.

they can be autotrophic as well as heterotrophic, unicellular as well as multicellular

they include kingdoms like protista, plantae, animalia, fungi et cetera.

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