Quiz #2
Part 1 of 8 - 9.99/ 16.65 Points
Question 1 of 30 0.0/ 3.33 Points
An organism that has more or less than the normal number of chromosomes is called:
A.Karyoploid
B.Haploid
C.Aneuploid
D.Phenoploid
E.Genoploid
Feedback: Aneuploid pertains to having an abnormal number of chromosomes.
Question 2 of 30 3.33/ 3.33 Points
A geneticist is studying the genetic makeup of a baby and discovers that part of chromosome five has a piece missing. The baby is suffering from:
A.Klinefelter syndrome
B.Turner syndrome
C. Down syndrome
D.Cri du Chat syndrome
E.Edward syndrome
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Question 3 of 30 0.0/ 3.33 Points
Meiosis results in a change in chromosome number indicated by:
A.N to n
B.2n to n
C.N to 2n
D.2n to 2n
E.2n to 2n in diploid organisms, n to n in haploid organism
Feedback: Meiosis results in a halving of the chromosome number from 2n (diploid) to n (haploid). Meiosis does not occur in an organism which is already haploid (such as a plant gametophyte).
Question 4 of 30 3.33/ 3.33 Points
This figure shows the cell cycle. What does "E" represent?
A.Interphase
B.G1
C.Mitosis
D.Cytokinesis
E.S
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Question 5 of 30 3.33/ 3.33 Points
During ______________, the nuclear envelope disappears, and the chromosomes become distinct.
A.Telophase
B.Metaphase
C.Prophase
D.Anaphase
E.Interphase
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Part 2 of 8 - 9.99/ 16.65 Points
Question 6 of 30 3.33/ 3.33 Points
Which of the following is not true about the prebiotic soup hypothesis?
A.It hypothesizes there was abundant energy.
B.Water vapor, nitrogen, carbon dioxide, and other chemicals were needed to facilitate this chemical reaction.
C.It hypothesizes that the Earth had a reducing atmosphere.
D.It is supported by the works of Miller and Urey.
E.Iron sulfides are needed to facilitate this chemical reaction.
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Question 7 of 30 3.33/ 3.33 Points
The innermost core of a virus's structure is made up of
A.a membrane envelope.
B.a protein capsid.
C.both DNA and RNA.
D.either DNA or RNA.
E.a protein spore coat.
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Question 8 of 30 3.33/ 3.33 Points
If you were studying the lytic cycle of viral reproduction, which stage would not be included in your studies?
A.Attachment
B.Integration
C.Maturation
D.Penetration
E.Biosynthesis
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Question 9 of 30 0.0/ 3.33 Points
Bacteria that can grow in the presence or absence of oxygen are called
A.aerobic.
B.obligate anaerobes.
C.facultative anaerobes.
D.autotrophic.
E.heterotrophic.
Feedback: Facultative anaerobes can grow in the presence or absence of oxygen.
Question 10 of 30 0.0/ 3.33 Points
Which statement is not true about a retrovirus?
A.It contains a genome of RNA.
B.It contains the enzyme reverse transcriptase.
C.It contains an enzyme to carry out the transcription of RNA to DNA.
D.Viral DNA remains in the host genome.
E.It contains a DNA genome.
Feedback: The genome of a retrovirus is RNA, not DNA. The virus contains the enzyme reverse transcriptase, which catalyzes the transcription of RNA to DNA. The viral DNA may then remain in the host genome.
Part 3 of 8 - 9.99/ 16.65 Points
Question 11 of 30 0.0/ 3.33 Points
Of the following statements about protists, which one is false?
A.They can reproduce sexually.
B.Only multicellular protists have a nucleus.
C.They can reproduce asexually.
D.They can be photosynthetic.
E.They can be heterotrophic.
Feedback: Protists are eukaryotes, and as such even the unicellular ones have a nucleus.
Question 12 of 30 0.0/ 3.33 Points
Which of the following terms does not apply to the diatoms?
A.Cellulose plates
B.Unicellular
C.Phytoplankton
D.Silica valves
E.Autotrophic
Feedback: Dinoflagellates, not diatoms, are protected by cellulose plates.
Question 13 of 30 3.33/ 3.33 Points
This figure shows the anatomy of a Euglena. What does "e" represent?
A.Pyrenoid
B.Eyespot
C.Nucleolus
D.Contractile vacuole
E.Carbohydrate vacuole
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Question 14 of 30 3.33/ 3.33 Points
Which of the following is a sexually transmitted disease?
A.Trypanosoma
B.Euglena
C.Giardia
D.Paramecium
E.Trichchomonas
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Question 15 of 30 3.33/ 3.33 Points
Which algae share most of the characteristics of plants?
A.Brown
B.Red
C.Diatoms
D.Dinoflagellates
E.Green
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Part 4 of 8 - 13.32/ 16.65 Points
Question 16 of 30 3.33/ 3.33 Points
Sphagnum is a type of ________ that has nonliving cells that can absorb moisture and can be used in gardening.
A.fern
B.angiosperm
C.moss
D.gymnosperm
E.algae
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Question 17 of 30 3.33/ 3.33 Points
The seeds of gymnosperms are mostly spread by
A.mammals.
B.water.
C.wind.
D.insects.
E.birds.
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Question 18 of 30 3.33/ 3.33 Points
Which part of the seed provides nourishment for the embryo?
A.The anther
B.The egg sac
C.The endosperm
D.The ovary
E.The seed coat
Feedback: The triploid endosperm provides nourishment for the embryo.
Question 19 of 30 0.0/ 3.33 Points
In the moss life cycle, the ______ generation is dominant.
A.Triploid sporophyte
B.Haploid gametophyte
C.Diploid gametophyte
D.Diploid sporophyte
E.Haploid sporophyte
Feedback: Mosses are bryophytes. In bryophytes, the gametophyte is the dominant generation.
Question 20 of 30 3.33/ 3.33 Points
The cell walls of fungi contain a large amount of
A.starch.
B.glucose.
C.phospholipids.
D.cellulose.
E.chitin.
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Part 5 of 8 - 6.66/ 6.66 Points
Question 21 of 30 3.33/ 3.33 Points
The main activity of the exercise was to do which of the following for each prepared slide?
A.Count the total number of cells in the field of view
B.Measure the diameter of the cells and determine the average
C.Label and count cells in the different phases of the cell cycle
D.Count the number of chromosomes per cell in each tissue.
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Question 22 of 30 3.33/ 3.33 Points
To calculate the mitotic index, you
A.add up the number of cells in interphase and divide by the number of cells in all the other phases of the cell cycle
B.calculate the ration of cell in metaphase to those in prophase and then multiply by 100
C.subtract the number of cells in the phases of mitosis from the number in interphase and multiply by 100
D.add up the number of cells in prophase, metaphase, anaphase and telophase and divide that number by the total number of cells. Then multiply by 100.
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Part 6 of 8 - 9.99/ 9.99 Points
Question 23 of 30 3.33/ 3.33 Points
Chromatin coils to form visible chromosomes during what phase of mitosis?
A.Anaphase
B.Telophase
C.Metaphase
D.Prophase
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Question 24 of 30 3.33/ 3.33 Points
During which phase of mitosis do sister chromatids separate and become separate chromosomes?
A.Anaphase
B.Telophase
C.Metaphase
D.Prophase
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Question 25 of 30 3.33/ 3.33 Points
You were required to label how many cells in each microscope slide?
A.Ten
B.Five
C.Twenty
D.Eight
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Part 7 of 8 - 9.99/ 9.99 Points
Question 26 of 30 3.33/ 3.33 Points
The cancerous tissues ranked by mitotic index in order from lowest to highest are:
A.Stomach, lung, ovary
B.Lung, stomach, ovary
C.Ovary, stomach, lung
D.Ovary, lung, stomach
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Question 27 of 30 3.33/ 3.33 Points
What observation can be made about cancer cells based on the mitotic indices that have been measured in normal versus cancer cells?
A.Cancerous cells spend more time in interphase
B.Cancerous cells divide at the same rate as normal cells
C.Cancerous cells divide more slowly than normal cells
D.Cancerous cells divide more often
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Question 28 of 30 3.33/ 3.33 Points
For both normal and cancerous tissue the most prevalent phase of the cell cycle was:
A.Prophase
B.Metaphase
C.Telophase
D.Interphase
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Part 8 of 8 - 6.66/ 6.66 Points
Question 29 of 30 3.33/ 3.33 Points
Explain how you calculated the mitotic index of each tissue sample.
To calculate the mitotic index of each sample, I counted the number of cells dividing in cell sample number 1 added them to the number of cells dividing in cell sample 2 and divided them by the total number of cells in the samples altogether (i.e. total number of cells in sample 1 + total number of samples in sample 2). Then I multiplied them by 100 to receive the mitotic index of the samples.
Comment: You described the calculation of mitotic index correctly.
Question 30 of 30 3.33/ 3.33 Points
Based on the results acquired through the lab simulation, which type of cancerous tissue was the slowest growing and what data did you use to come to this decision?
Based upon the mitotic index of each of the cancerous tissues, it can be reasonably concluded that the slowest growing cancerous tissue is within the lungs. As I reviewed the mitotic index from the lab, I attempted to discern the reasoning behind its slow growth in comparison to the others, and given the limited information from the lab, I could not determine a reason. It is possible that the constant metabolic activity in the stomach and the lungs could have some control over the mitosis of the cells in that region.
Comment: Yes, you are correct lung tissue was the slowest growing cancerous tissue because it had the lowest mitotic index.
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