csu bio110 unit 2 assessment done

26 Jun csu bio110 unit 2 assessment done

Question
Question 1
Assume that Tay-Sachs disease only affects homozygous recessive individuals. If two parents are carriers, what are the chances that their child would have the disease?
50%
25%
0%
100%
5 points

Question 2
Genes are segments of ________ that code for _________ synthesis.
Chromosomes; amino acids
Alleles; polysaccharide
Chromosomes; DNA
Chromosomes; protein
5 points

Question 3
Imagine that a researcher has found an unusual cell that seems to be unable to replicate its DNA. The problem is most likely linked to which phase of the cell cycle?
mitosis
G2 of interphase
Cytokinesis
S of interphase
5 points

Question 4
Which of the following cells contains the fewest number of chromosomes?
An unfertilized human egg
An egg cell from a terrier dog
A human ovary cell
A human testis cell from a male with kleinfelter syndrome
5 points

Question 5
If a gene sequence in one strand of DNA reads ACCGTTCGA, then when the DNA is unwound and replicated, the newly created strand opposite of this will read ________.
CAATGGATC
ACCGTTCGA
TGGCAAGCT
GTTACCTAG
5 points

Question 6
All normal human body cells contain __________ chromosome(s).
54
23
46
98
5 points

Question 7
Helen constantly puts off her yearly physical exam, which involves a Pap smear to detect cervical cancer. She makes the statement, “I have nothing to worry about. Cervical cancer doesn’t run in my family and I have a healthy lifestyle.” Is this a valid reason for not getting a physical every year?
Yes. Cervical cancer tends to be genetic, so if she doesn’t have a family history, she probably isn’t at risk.
No. Cervical cancer is often caused by environmental factors which have nothing to do with family history.
Probably. Although Helen should be tested annually if she takes oral contraceptives, since they increase her risk of cervical cancer.
Probably. Since Helen has a healthy lifestyle, she has probably avoided most of the risk factors for cervical cancer.
5 points

Question 8
Which of the following is a gene that is associated with ovarian cancer?
Rb
p53
BRCA1
HER2
5 points

Question 9
Scientists attempting to develop a new chemotherapy drug would consider that the best candidate to work on would be a drug that ________.
Stimulates cytokinesis
Prevents cells from forming spindle fibers
Produces growth factors
Impairs the immune system of a patient
5 points

Question 10
How do antioxidants reduce the risk of cancer?
They prevent the unregulated loss of electrons from molecules in cells, including DNA.
They decrease rates of cell replication and division.
They increase the abundance of repressor proteins in the body.
They mimic chemotherapeutic agents and, thereby, interrupt cell division.

Cancer and Genetics

Unit II Assessment

Introduction

In order for organisms to grow, repair, maintain, and reproduce, cells undergo cell division. Sometimes, cells uncontrollably divide, resulting in cancer. In the first part of the Cancer and Cell Division Lab, you will learn about normal cell division and will compare it to cell division that occurs in cancer cells. You will then visit a website to find out more information about cancer. You will learn why it occurs, why it kills, and new treatments that are being tested and used to treat cancer.

Objectives

1. Explain the process of cancer, the effects on the human body, the various types, and the risk factors involved.

2. Explain various treatments for cancer.

3. Explain the various stages of mitosis.

Materials

No extra materials will be required to complete this lab other than internet service.

Directions

· Go to the following website:http://www.mhhe.com/biosci/genbio/virtual_labs/BL_23/BL_23.html

· Follow the steps under the Procedure section.

· Type all answers directly on the data sheet.

· Select Save As, and save this document using your last name and student ID as the file name.

· Upload the data sheet as a .doc, .docx, or rtf file when you are finished.

While viewing the video, answer the following questions. Each question is worth 2 points.Total: 4 points

1. In which stage of cell division is the DNA copied?

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2. During which stage of mitosis do the chromosomes line up in the middle?

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After viewing the video, click on the Information tab in the bottom right corner. Answer the following questions. Each question is worth 2 points.Total: 6 points

1. In which of the cancer types listed, are males not at risk of developing?

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2. Cigarette smoke is a major risk factor for which type of cancer listed?

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3. The risk for which type of cancer increases after the age of 55?

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Continue following the directions under the Procedure Section, and complete the following table. The table isworth 17 points.

Interphase

Prophase

Metaphase

Anaphase

Telophase

% of Cells Dividing

% of Cells at rest

Normal Lungs

Cancerous Lungs

Normal Stomach

Cancerous Stomach

Normal Ovary

Cancerous Ovary

Continue following the directions under the Procedures section and answer the following questions. Each question is worth 3 points.Total: 9 points

1. Based on your data and observations, what are some of the Differences between normal cells and cancer cells?

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2. Which type of cancer shows the most aggressive growth? Explain your answer.

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3. When studying cell division in tissue samples, scientists often calculate a mitotic index, which is the ratio of dividing cells to the total number of cells in the sample. Scientists often calculate the mitotic index to compare the growth rates of different types of tissue. Which type of tissue would have a higher mitotic index, normal tissue or cancerous tissue? Explain.

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Go to:http://www.cancer.org/

Click on: Learn About Cancer. View each section contained in the menu under Learn About Cancer Topics and answer the following questions. Each question is worth 2 points.Total: 14 points

1. How many people in the US get cancer each year?

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2. What causes cancer?

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3. Since there are many different types of cancer, how is cancer named?

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4. List 2 signs or symptoms of breast cancer.

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5. Can males development breast cancer?

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6. What is the most common type of cancer?

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7. List two ways you could get involved and help fight against cancer.

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