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BIO 340 Exam 1 Questions And 100% Correct Answers Latest Update
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BIO 340 Exam 1 Questions And 100%Correct Answers Latest Update
Mitosis - ANSWER -Creates two daughter cells IDENTICAL to parent.
-Happens in Somatic cells
-Parent cells is diploid (2n). So if there are 3 pairs of chromosomes 2n=6.
Human karyotpye is 2n=46
What is function of mitosis and meiosis? - ANSWER They ensure the genetic continuity
of nucleated cells
What are the phases of the cell cycle? - ANSWER G1: growth and metabolism
S: DNA synthesis and chromosome duplication
G2: preparation for mitosis
M: Divison
Steps of Mitosis - ANSWER IPMAT
1. Interphase
2. Prophase
3. Metaphase
,4. Anaphase
5. Telophase
6. Cytokinesis
Interphase (Mitosis) - ANSWER Chromosomes duplicate to produce sister
chromatids.
Prophase (Mitosis) - ANSWER -Chromosomes become paired chromatids and are
visible.
-The nuclear envelope also disappears.
-Duplicated chromosomes condense
Metaphase (Mitosis) - ANSWER Chromosomes line up in the middle of the cell
and attach to spindle fibers.
Anaphase (Mitosis) - ANSWER Chromosomes are pulled apart from each other
and towards the poles of the spindle
Telophase (Mitosis) - ANSWER -chromosomes are at opposite
ends of cell and nuclear envelope begins to form and separates
chromosomes into two new cells
-Chromosomes de-condense
Cytokinesis (Mitosis) - ANSWER final stage in which the two cells
actually divide.
What is present before replication (Mitosis)? - ANSWER -1 chromosome
,-1 chromatid
-1 piece of DNA
What is present after replication (Mitosis)? - ANSWER -1 chromosome
-2 chromatids
-2 pieces of DNA
Sister chromatids are what? -ANSWER Identical copies
During which stages of the cell cycle will you probably not view chromosomes but
uncondensed DNA?
i. During Gap 1
ii. During Synthesis
iii. During gap 2
iv. All of the above -ANSWER iv. All of the above
Where are genes found? -ANSWER -On chromosomes
-Each chromosome has a unique collection of genes in specific positions
How many chromatids are in a cell of an organism that has 4 chromosomes in G1 and
G2? -ANWER- G1: 4 chromatids
-G2: 8 chromatids
What properties do you associate with eukaryotic chromosomes? -ANWER- DNA carries
the genes
-The molecule is linear
-Most of the time it is present in the cell in its uncoiled form associated with
proteins and RNA (chromatin)
, -Its fragile and diffuse, which is a problem for cell division
--The solution for this is to package by multiple condensation
How many centrioles do centrosomes in animal cells have? - ANSWER 2
Microtubules - ANSWER -form around the centrosomes
-build the spindle
apparatus
-some attach to the kinetochores which are on the
centromeres of chromosomes during cell division.
-They help pull
the chromosomes apart during anaphase
Chromatin - ANSWER -the DNA that makes up a chromosome
-Chromosomes are the pieces of DNA made up of chromatin
Chromatids ANSWER the identical pieces of DNA held together by
centromeres
Meiosis ANSWER - has two parts! At the end you get four haploid cells that are unique
- Required for the process of each parent contributing one set of homologs to offspring
What are most animals and plants (Haploid, Diploid, etc)? ANSWER -Diploid, they have 2
homologous copies of each chromosome
-One copy is inherited from the mother, the other from the father
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