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Bio Principles Unit 3 Exam Questions And Correct Answers
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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.
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