Question

question 7
the cell cycle checkpoints are responsible for checking that the cell is prepared to move on to the next stage in cell division. for example, the g1 - to - s checkpoint ensures that the cell has all the components and signals necessary to go on to s phase and that the appropriate signals are present. the g2 checkpoint checks whether the.
a chromosomes have been separated properly.
b dna has been replicated properly.
c chromosomes have aligned properly.
d dna has decondensed.
e cell organelles have duplicated properly.

question 8
___ is a decades old example of successful stem cell therapy.
a kidney transplants
b liver transplants
c bone - marrow transplants
d heart transplants

Explanation:

Question 7

The G2 checkpoint occurs after DNA replication (which happens in the S phase). Its main role is to check if DNA has been replicated properly before the cell enters mitosis. Chromosome separation (A) is checked at the metaphase - anaphase transition (spindle checkpoint). Chromosome alignment (C) is also part of the spindle checkpoint. DNA decondensation (D) occurs at the end of mitosis. Organelle duplication (E) is not the main focus of the G2 checkpoint.

Bone - marrow transplants involve transplanting hematopoietic stem cells. Kidney transplants (A), liver transplants (B), and heart transplants (D) are organ transplants, not stem - cell - based therapies in the traditional sense of stem cell therapy (where stem cells are used to regenerate or repair tissues). Bone - marrow transplants have been used for decades to treat various blood disorders and cancers.

Answer:

B. DNA has been replicated properly.

Question 8