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UCI Bio 93 Final Exam Questions And 100% Correct Answers
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UCI Bio 93 Final Exam Questions And100% Correct Answers
What do the four most common elements of living matter make up? - Answer
Hydrogen, Oxygen, Nitrogen, and Carbon --make up 96% of all living matter.
Properties of Acids - Answer Donate H+ to a solution, accept electrons, and have a pH of
<7
What happens during the S phase of the cell cycle? - Answer DNA Synthesis
Cell Cycle Worksheet What occurs during the G1 phase of the cell cycle? - Answer
Growth -- cell contents are duplicated.
What occurs during the G2 phase of the cell cycle? - Answer More growth and
preparation for division.
What occurs during the M phase of the cell cycle? - Answer Mitosis (and cytokinesis --
division of the cell).
What are the subphases of mitosis? - Answer Prophase, Pre-metaphase, Metaphase,
Anaphase, and Telophase.
How many checkpoints are in the cell cycle? -Answer 3 -- G1 checkpoint, G2 checkpoint,
and the M checkpoint.
What is a Karyotype? -Answer A display of Metaphase chromosomes paired with their
homologous pairs.
,What is a diploid cell? -Answer A cell containing 46 chromosomes -- somatic cells.
What is a haploid cell? -Answer A cell containing 23 chromosomes -- sex cells.
From what does the mesoderm give rise? -Answer the notochord, something similar to a
spinal chord.
From what does the endoderm give rise? -Answer the digestive tract.
From what does the ectoderm give rise? -Answer the nervous system-brain/neural plate.
If 2n = 18, how many chromosomes come from mom? -Answer 9 -- half from mom and
half from dad.
Meiosis - 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? - Answer Non-sister chromatids.
What are the steps of meiosis? - Answer Prophase I, Metaphase I, Anaphase I,
Telophase I & cytokinesis (then a second set of phases)
Meiosis 1 deals with homologous chromosomes.
Prophase 1 consists of which events listed below? The chromosomes condense, the
nuclear envelope breaks down, chromosomes cross over, and meiotic spindle forms.
, Metaphase 1 consists of which events listed below? the pairs of homologous
chromosomes are now tightly condensed and coiled and become arranged on the
metaphase plate.
What happens during anaphase 1? ANS The pairs of chromosomes are separated by the
spindle fibres.
What happens during Telophase I and cytokinesis? -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 consisting of two chromatids. A nuclear envelope reforms around each
chromosome set, the spindle disappears, and cytokinesis follows.
What happens during meiosis 2? -Answer sister chromatids separate.
What happens in prophase 2 of meiosis? -Answer A new spindle forms around the
chromosomes.
What happens in metaphase 2 of meiosis? - Answer Metaphase 2 chromosomes line up
at the equator.
What happens in anaphase 2 of meiosis? - Answer Centromeres divide chromatids move
to opposite poles of the cells.
What happens during telophase 2 of meiosis? -Answer A nuclear envelope forms around
each set of chromosomes and the cytoplasm divides.
What makes meiosis a unique form of cell division -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 add to genetic variation? Independent assortment meiosis 1 --
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