Ch 9 mastering biology

During _____ both the contents of the nucleus and the cytoplasm are divided.the mitotic phase
During _____ the cell grows and replicates both its organelles and its chromosomes.interphase
Which of the following is a function of the S phase in the cell cycle?The synthesis of sister chromatids
The copying of chromosomes occurs during which of the following phases of the cell cycle?S phase
For the first several divisions of early frog embryos, cells proceed directly from the M phase to the S phase and back to M without gaps. Which of the following is likely to be true about dividing cells in early frog embryos?The cells get smaller with each generation
True or false? The M phase is characterized by the replication and division of a cell’s chromosomes.False
If an organism normally has 34 chromosomes, how many molecules of DNA should there be in the G1 phase of the cell cycle?34
Which of the following events would cause the cell cycle to arrest?Poor nutrient conditions
Nucleoli are present during _____.Interphase
Cytokinesis often, but not always, accompanies _____.telophase
Chromosomes become visible during _____.prophase
Centromeres divide and sister chromatids become full-fledged chromosomes during _____.anaphase
Spindle fibers attach to kinetochores during _____.prometaphase
During prophase a homologous pair of chromosomes consists of _____.two chromosomes and four chromatids
DNA replication produces two identical DNA molecules, called _________, which separate during mitosissister chromatids
After chromosomes condense, the ___________ is the region where the identical DNA molecules are most tightly attached to each other.centromeres
During mitosis, microtubules attach to chromosomes at the ____________.kinetochore(s)
In dividing cells, most of the cell’s growth occurs during ____________.interphase
The ____________ is a cell structure consisting of microtubules, which forms during early mitosis and plays a role in cell divisionmitotic spindle(s)
During interphase, most of the nucleus is filled with a complex of DNA and protein in a dispersed form called ___________.chromatin
In most eukaryotes, division of the nucleus is followed by __________, when the rest of the cell dividescytokinesis
The __________ are the organizing centers for microtubules involved in separating chromosomes during mitosiscentrosomes
During prophase, the microtubules of the mitotic spindle __________.lengthen
During anaphase, the nonkinetochore microtubules __________ and move past each other, and the kinetochore microtubules _________.lengthen, shorten
During telophase, the nonkinetochore microtubules _________.disassemble
Which of these is NOT a carcinogen?
A. fat
B. UV light
C. testosterone
D. cigarette smoke
E. all of the above are carcinogens
E
_____ is a carcinogen that promotes colon cancer.fat
Prior to this new technique, how were mice given cancerous tumors?The tumors were implanted under the skin
You are an oncologist. A patient presents with advanced prostate cancer and you follow standard protocol. What do you do?The patient is treated with chemical castration
You are an endocrinologist studying new treatments for prostate cancer. You have a patient with an unusually large level of dihydrotestosterone. Which of the following is true?Your patient’s cancer has become resistant to the standard treatment
Which of the following is true regarding prostate cancer cells?They can activate and inactivate certain genes
Your uncle has prostate cancer. Which of the following indicates improvement in his condition?A decreasing PSA