Adiploid cell the number of chromosomes as a haploid cell.
one-fourth
half
twice
four times

Twice.

Explanation:

Diploid cell may be defined as the cell that contain the diploid sets of chromosome (2X) here X represent the chromosome number. Human are diploid cell and each cell contains the set of a chromosome.  

Haploid cells contain a single set of chromosome (X). Human gametes are haploid cells. The diploid cell has twice the chromosome number as haploid cell.

Thus, the correct answer is option (3).

the relative standard reduction potential of the half-cell in which reduction occurs; more positive than the other half-cell. reduction is a chemical process in which electrons are added to an atom or an ion; it always occurs accompanied by oxidation of the reducing agent.

atp is used for energy.