UCI Bio 93 Final Questions And Answers Well Illustrated.
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UCI Bio 93
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UCI Bio 93
UCI Bio 93 Final Questions And Answers Well Illustrated.
What are the four most common elements in living matter? - correct answer. Hydrogen, Oxygen, Nitrogen, and Carbon --make up 96% of all living matter.
Properties of Acids - correct answer. Donate H+ to a solution, accept ...
UCI Bio 93 Final Questions And Answers
Well Illustrated.
What are the four most common elements in living matter? - correct answer.
Hydrogen, Oxygen, Nitrogen, and Carbon --make up 96% of all living matter.
Properties of Acids - correct answer. Donate H+ to a solution, accept electrons, and
have a pH of <7
What happens in the S phase of the cell cycle? - correct answer. DNA Synthesis
What happens in the G1 phase of the cell cycle? - correct answer. Growth -- cell
contents are duplicated.
What happens in the G2 phase of the cell cycle? - correct answer. More growth and
preparation for division.
What happens in the M phase of the cell cycle? - correct answer. Mitosis (and
cytokinesis -- division of the cell).
What are the subphases of mitosis? - correct answer. Prophase, Pre-metaphase,
Metaphase, Anaphase, and Telophase.
How many checkpoints are there in the cell cycle? - correct answer. 3 -- G1
checkpoint, G2 checkpoint, and the M checkpoint.
What is a Karyotype? - correct answer. A layout of Metaphase chromosomes matched
with their homologous pairs.
What is a diploid cell? - correct answer. A cell with 46 chromosomes -- somatic cells.
What is a haploid cell? - correct answer. A cell with 23 chromosomes -- sex cells.
,What does the mesoderm give rise to? - correct answer. the notochord (similar to a
spinal chord).
What does the endoderm give rise to? - correct answer. the digestive tract.
What does the ectoderm give rise to? - correct answer. the nervous system
(brain)/neural plate.
If 2n = 18, how many chromosomes come from the mother? - correct answer. 9 -- half
from mom and half from dad
Meiosis - correct answer. Meiosis is a specialized type of cell division that reduces the
chromosome number by half, creating four haploid cells, each genetically distinct from
the parent cell that gave rise to them.
What two structures does the chiasma connect? - correct answer. Non-sister
chromatids.
What are the steps of meiosis? - correct answer. Prophase I, Metaphase I, Anaphase
I, Telophase I & cytokinesis (then a second set of phases)
What does meiosis 1 deal with? - correct answer. homologous chromosomes.
What happens in prophase 1? - correct answer. The chromosomes condense, the
nuclear envelope breaks down, chromosomes cross over, and meiotic spindle forms.
What happens in metaphase 1? - correct answer. the pairs of homologous
chromosomes are now tightly condensed and coiled and become arranged on the
metaphase plate.
What happens in anaphase 1? - correct answer. the pairs of chromosomes are pulled
apart by the spindle fibers (microtubules).
What happens in Telophase 1 and cytokinesis? - correct answer. The homologous
chromosome pairs complete their migration to the two poles as a result of the action of
the spindle. Now a haploid set of chromosomes is at each pole, with each chromosome
still having two chromatids. A nuclear envelope reforms around each chromosome set,
the spindle disappears, and cytokinesis follows.
What happens during meiosis 2? - correct answer. sister chromatids separate.
What happens in prophase 2 of meiosis? - correct answer. A new spindle forms
around the chromosomes.
What happens in metaphase 2 of meiosis? - correct answer. Metaphase 2
chromosomes line up at the equator.
, What happens in anaphase 2 of meiosis? - correct answer. Centromeres divide
chromatids move to opposite poles of the cells.
What happens during telophase 2 of meiosis? - correct answer. A nuclear envelope
forms around each set of chromosomes and the cytoplasm divides.
What makes meiosis a unique form of cell division - correct answer. Synapsis and
crossing over -- occurs in prophase 1, pairing up of homologous chromosomes,
homologous chromosomes cross over and exchange corresponding genetic information
(the DNA exchanged contain the same genes, but may have different alleles).
How does meiosis increase genetic variability? - correct answer. Independent
assortment (meiosis 1 -- homologous chromosomes separate independently), crossing
over (genetic recombination, prophase 1), and random fertilization (any egg can join
with any sperm -- most effective way to obtain genetic variability).
What is the law of segregation? - correct answer. Alleles coding for the same trait
separate independently during gamete formation.
What is non-disjunction? - correct answer. When homologous chromosomes or sister
chromatids do not separate properly.
What is a character? - correct answer. An observable heritable feature that may vary
among individuals. Ex: flower color.
What is a trait? - correct answer. One of two or more detectable variants in a genetic
character. Ex: purple flower color/white flower color.
What does the blending theory state? Is this true? - correct answer. The offspring is a
blend of both parents (ex: a tall mom giraffe + a short dad giraffe = a medium height
giraffe). This is not true because if so, every single offspring would look the same.
What does particulate inheritance state? Is this true? - correct answer. Different traits
are inherited in separate distinct units (genes) (ex: F1 and F2 generations). This is
always true because of not every offspring looks the exact same (has the exact same
genetics).
What is an allele? - correct answer. An alternate form of a gene (ex: the gene that
determines hair color).
What does the Law of Segregation state? - correct answer. The Law of Segregation
states that two alleles in a pair segregate into different gametes. (this deals with
separation of homologous pairs in Meiosis 1 producing haploid daughter cells after
Meiosis 1).
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