02:29GCSE Biology - What is Cancer? 'Benign' and 'Malignant' Tumours Explained #43Cognito1074views1rank
Multiple ChoiceWhich of the following processes do normal proto-oncogenes typically exhibit?1893views7rank
Multiple ChoiceWhen activated by signals in the cell, Protein X can stop cells from growing and dividing into new cells. What type of gene codes for Protein X?1468views6rank
Multiple ChoiceWhich of the following hypotheses is best supported by observing cancer cells in a culture? 687views
Multiple ChoiceWhich of the following accurately characterizes our current understanding of cancer development? 637views
Textbook QuestionVinblastine is a standard chemotherapeutic drug used to treat cancer. Because it interferes with the assembly of microtubules, its effectiveness must be related to a. disruption of mitotic spindle formation. b. suppression of cyclin production. c. myosin denaturation and inhibition of cleavage furrow formation. d.inhibition of DNA synthesis.2148views
Textbook QuestionOne difference between cancer cells and normal cells is that cancer cells a. are unable to synthesize DNA. b. are arrested at the S phase of the cell cycle. c. continue to divide even when they are tightly packed together. d. cannot function properly because they are affected by density-dependent inhibition.846views
Textbook QuestionEvaluate each of the following defects. Which could lead to uncontrolled growth in cancer? Select True or False for each statement. T/F The overexpression of MPF activity. T/F A nonfunctional Rb protein. T/F The overexpression of G1 cyclin. T/F A nonfunctional E2F protein.790views
Textbook QuestionAll your cells contain proto-oncogenes, which can change into cancer-causing oncogenes. Why do cells possess such potential time bombs?821views
Textbook QuestionCompare and contrast the effects of removing growth factors from asynchronous cultures of human cells that are normal and those that are cancerous.575views
Textbook QuestionProto-oncogenes can change into oncogenes that cause cancer. Which of the following best explains the presence of these potential time bombs in eukaryotic cells? a. Proto-oncogenes first arose from viral infections. b. Proto-oncogenes are mutant versions of normal genes. c. Proto-oncogenes are genetic 'junk.' d. Proto-oncogenes normally help regulate cell division.1072views
Textbook QuestionScientific Thinking The study described in Module 8.10 was purely observational; there were no controlled groups. Imagine that you are an oncologist. Design a hypothesis-driven study to determine whether mastectomy improves breast cancer survival over lumpectomy. What are your control groups? Would such a study be ethical to undertake? Why or why not?609views