Exam (elaborations)
WGU C190- Biology Unit 5 Exam Questions and Complete Solutions Graded A+.
- Course
- Institution
WGU C190- Biology Unit 5 Exam Questions and Complete Solutions Graded A+.
[Show more]
Content preview
WGU C190- Biology Unit 5 ExamQuestions and Complete Solutions
Graded A+
Cell Cycle - Answer: - the "life cycle" of a cell. It is the set of stages that a cell goes through during its
lifetime.
- Cells go through five major stages of development: G1, synthesis (S), G2, mitosis (M), and cytokinesis.
Interphase - Answer: - divided into three phases: G1, S, and G2.
- In G1, the cell is actively growing and producing enzymes and other components needed for the next
stages of the cell cycle. Once the cell has produced everything it needs, it moves on to the next stage of
the cell cycle.
- The next stage of interphase is the S phase; the "S" refers to "synthesis" because this is the stage of the
cell cycle that a duplicate copy of the chromosomes is synthesized (built). Copying of DNA is also called
DNA replication. Replication enzymes are used to build two identical copies of the DNA. Once the DNA is
fully copied, the cell moves on to the next stage.
- The G2 stage is similar to G1 in that the cell is actively growing and producing materials needed for the
next stage. It is also checking its DNA for errors. Once the cell is ready, it moves on to the next stage.
Mitosis - Answer: - Once the cell has copied its DNA and has ensured that all necessary components are
in place, it is ready to split the single nucleus into two separate nuclei.
- Mitosis separates the DNA into two identical copies in two nuclei
Cytokinesis - Answer: - separates the nuclei into two new cells.
- The root "cyto-" means "cell" and "kinesis" refers to movement because the cells are moving apart.
, In which phase of the cell cycle does DNA replication take place? - Answer: - DNA replication takes place
in the S phase
Interphase is the part of the cell cycle when the cell _____________________. - Answer: - grows and
duplicates its DNA
- The cell grows in G1, duplicates its DNA in S, and makes final preparations in G2.
In which stage of the cell cycle are new daughter cells formed? - Answer: - Cytokinesis
- During cytokinesis the cytoplasm and membrane of the parental cell is split in order to form two
daughter cells.
Chromosomes - Answer: - threadlike structures made of DNA molecules that contain the genes
- Chromosomes are made up of two major parts: DNA and proteins called histones.
When a cell is ready to move DNA, what do the chromosomes do? - Answer: - the chromosomes will
condense, or tightly compact. This condensed coiling of chromosomes makes the movement of the long
DNA molecules easier and less prone to problems.
What is the function of histones? - Answer: - used to support winding and unwinding of the DNA
depending on what the cell's needs are
Explain what happens to chromosomes after S Phase. - Answer: - When a cell divides in mitosis, each
daughter cell receives a copy of each chromosome.
- Therefore, each chromosome must be copied (replicated) prior to mitosis. This occurs in the S stage of
the cell cycle.
- After a chromosome has replicated, the two copies remain attached at a point called the centromere.
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller YourExamplug. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $14.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
77764 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now