Bio Lab Questions
Cytokinesis usually but not always follows mitosis. If a cell undergoes mitosis and not cytokinesis this would result in what?
A cell with two or more nuclei
Apoptosis occurs when?
A damaged cell is programmed to fragment and then is phagocytized
Which of the following statements is correct? A. Meiosis involves 2 divisions and produces 4 non-identical daughter nuclei B. Meiosis involves 1 division and produces 2 non-identical nuclei C. Mitosis involves 1 division and produces 2 non-identical daughter nuclei
A. Meiosis involves 2 divisions and produces 4 non-identical daughter nuclei
All of the following statements are true about mitosis except... A. The cells arriving from the process are genetically alike B. The process of mitosis is followed by cytokinesis C. Spindle fibers are involved in the movement of chromosomes D. The cells arising from the process contain only half of the necessary genetic material
D. The cells arising from the process contain only half of the necessary genetic material
S phase is part of the cell cycle in which what is replicated?
DNA
A cell is inhibited during S phase of its cycle. It will not reproduce due to lack of what?
DNA synthesis
When during the cell cycle are chromosomes visible?
During Mitosis
During prophase I, a diploid organism contains how many copies of each gene?
4
Down syndrome is associated with which of the following karyotypes?
47, XY, trisomy 21
If a cell has 46 chromosomes at the beginning of mitosis then at the end of anaphase there would be a total of what?
92 chromosomes
The G2 checkpoint prevents the cell cycle from continuing until what?
The DNA is completely replicated AND the damage to DNA can be repaired
In each gamete following telophase II, how many copies of each gene is/are present?
1
During G1 stage of interphase, a diploid organism contains how many copies of each gene?
2
During prophase II, a diploid organism contains how many copies of each gene?
2
If there are 20 centromeres in a cell how many chromosomes are there?
20
Which of the following is a correct match? A. the separation of tetrads-anaphase II B. synapsis-metaphase I C. separation of sister chromatids-anaphase II
C. separation of sister chromatids-anaphase II
Cyclins function by what?
Combining with kinases
The looping of DNA around histone proteins do what?
Compact the DNA allowing a large amount of DNA to fit into the cell
One major difference between meiosis I and meiosis II is the?
Crossing over occurs in prophase of meiosis I but not in prophase of meiosis II
Proteins that are involved in the regulation of the cell cycle and that show fluctuation in concentration during the cell cycle are called what?
Cyclins
During meiosis I, the homologous chromosomes of a tetrad do what?
Face opposite spindle pole
What does interphase consist of?
G1, S, G2
Multicellular organisms undergo mitotic cell division to do what?
Increases the size of the organism
Which of the following processes does not contribute to creating genetic variability in the offspring?
Interkinesis
What are a type of internal signal molecule used in controlling the cell cycle?
Kinases
The mitotic spindle is composed of BLANK and grows from the BLANK toward the center of the cell.
Microtubules; centrosome
Cells that do not receive the correct signals to move from G1 into S phase will enter G0 and therefore will what?
Not undergo mitotic division unless it later receives the go ahead signal
DNA and histones form beadlike globules known as what?
Nucleosomes
Unicellular organisms undergo mitotic division to do what?
Produce new organisms
Apoptosis is what?
Programmed cell death
What are the phases of mitosis?
Prophase, metaphase, anaphase, telophase
What is the correct order of mitosis?
Prophase, metaphase, anaphase, telophase
What would occur in a cell if the production of cyclins halted during the cell cycle?
The cell would remain the G2 phase and would not enter mitosis
A mutation results in a cell that no longer produces a normal protein kinase for the M phase checkpoint. What would likely be the immediate result of this mutation?
The cell would undergo normal mitosis but fail to enter the next G1
How do the daughter cells at the end of mitosis and cytokinesis compare to their parent cell when it was in G1 of the cell cycle?
The daughter cells have the same amount of chromosomes but half the amount of DNA
The possibility of Down Syndrome increases as the mother's age increases because?
The possibility of nondisjunction increases
The spindle serves two rolls in mitotic division these are what?
To separate the sister chromatids and to elongate the cell
Some multicellular organisms, like the hydra, use asexual reproduction to produce a bud that leads to a new organism. This means that they are what?
Using mitotic division to create new cells that become a new organism
