Exam (elaborations)
Bio Principles Unit 3 Exam Questions And Correct Answers
- Course
- Institution
Bio Principles Unit 3 Exam Questions And Correct Answers...
[Show more]
Content preview
Bio Principles Unit 3 Exam Questions And Correct Answerswhat do cells do to reproduce and perpetuate the species - Answer reproduce
cell reproduction involves - Answer mitosis and cytokinesis
cells that evolve through mitosis and cytokinesis are - Answer identical
In some organisms cells, mitosis occurs without cytoki-nesis. This will result in - Answer
cells with more than one nucleus.
meiosis is a form of sexual reproduction that involves - Answer species that reproduce
sexually
meiosis scrambles the genetic information from both of the parents and - Answer
reduces the chromosome number by ½ to produce eggs and sperm.
-insures variation
chromosomes - Answer -a cellular structure carrying genetic material.
-found in the nucleus of eukaryotic cells
-each chromosome consists of one very long DNA molecule and associated proteins
-chromosome=dyad; two chromatid when duplicated
somatic cells - Answer -any cell in a multicellular organism except a sperm, or egg or
their precurser
gametes - Answer -a haploid reproductive cell
-egg or sperm
-unite during sexual reproduction to produce a diploid zygote
the only haploid cells we have in our bodies are - Answer gametes
at fertilization, the full complement of paired chromosomes - Answer is restored
mitosis - Answer -division and replication of the nucleus into two identical nuclie
,-can occur independently, but typically includes cytokinesis
-conserves chromosome number by dividing up replicated chromosomes to each of the
daughter uncle
-PMAT
cell reproduction Answer cell division, including cytokinesis and usually mitosis
reduction of chromosomes -Answer reducing chromosome number is absolutely
essential in reproducing species
a sexual reproduction - Answer reproduction with use of only one individual by budding
or by the division of a single cell or the entire organism into two or more parts.
What is the advantage of sexual reproduction over asexual reproduction? - Answer
-sexual reproduction offers more variation and offspring that are more genetically
unique
do bacteria undergo mitosis? - Answer No-(mitosis is duplication and division of the
nucleus)
-bacteria undergo BINARY FISSION
prokaryotic cells are - Answer less complicated
Is cell reproduction/division synonymous with mitosis? - Answer No. Mitosis is the
division of the nucleus, mitosis can occur without cell division
.do all cells divide after they are produced? - Answer no-muscle tissue/neurons do not
divide, as well as liver
-no need to go to G1, stays at G0
Cell cycle - Answer PMAT
-cells go through four stages during cell reproduction
,-an ordered sequence of events in the life of a cell
What are the 7 Phases of the Cell Cycle? - Answer interphase
g1
s1
g2
mitotic phase
mitosis
cytokinesis
interphase - Answer -phases G1, S, G2
-portion of the cell with main metabolic activity- cellular respiration, photosynthesis,
making protein
-"the resting phase" but not really at rest
-no dividing
-accounts for 90% of cell cycle
-produces a lot of ATP
condition of DNA in interphase - Answer there are the same number of chromosomes in
G1 46 and G2 46, S 92
chromatin - Answer -loosley scattered arrangement of chromosomes in interphase
-DNA-protein complex found in eukaryotic cells, condition of dna during interphase
when the cell is not deviding, - Answer chromatin exists in its dispersed form.
-very long, thin fibers that are not visible with a light telescope
g1 - Answer -the first gap phase
, -site of active growth and metabolism
-unduplicated DNA present
-this is a gap between metabolic and duplication
-final destination for adult cells:neurons and muscles
A cell has half as much DNA as some other cell in a mitotically active tissue. The cell in
question is likely to be in - Answer G1.
S - Answer -synthesis phase
-DNA Synthesis and duplication of chromosomes
-twisted helix
-physically separated from mitosis by 2 gaps, g1 and g2
g2 - Answer -synthesis of molecules in preparation for cell division (mitosis)
-produces microtubules for mitosis and meiosis.
-DNA is already duplicated at this stage
-rapid production of tubules and asters
tubules are made in G2 to - Answer form spindle fibers
What happens in the S Phase? - Answer -Dna synthesis.
-at the beginning each chromosome is single
-at the conclusion of each chromosome is comprised of two sister chromosomes
what occurs during G1? - Answer This is the part of the cell cycle immediately following
division, but before DNA synthesis. The cell is growing through production of proteins
and organelles.
what occurs during G2? - Answer This third subphase of interphase is also a period of
metabolic activity and growth. The cell is making final preparations for division.
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 Easton. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $9.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
75632 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now