During the cell cycle, proteins called cyclins bind to enzymes that send signals for the cell to progress through stages of cell replication. At the end of this cycle, the cyclins degrade to prevent further signaling for the cell to divide.
Uncontrolled production of cyclins will most likely result in —
A student produced a model to demonstrate the cell cycle and its importance in the development of cancer cells.
Exposure to radiation at which location on the model may cause cancer cells to develop due to mutations?
Normal cells have a contact inhibition feedback mechanism that prevents the cells from replicating when other cells are touched.
A diagram of cells with contact inhibition and cells without contact inhibition is shown.
Which statement best describes what will happen to the cells in an organism that lacks contact inhibition?
AAC
The diagram below represents the cell cycle.
When cells leave the cell cycle, they exit during G1 phase and then enter G0 phase, a resting period. Most normal cells can leave G0 phase and reenter the cell cycle at G1 phase before entering S phase.
Cancer cells are different because they cannot enter G0 phase and are likely to do which of the following?
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Dogs have 39 pairs of chromosomes in their somatic cells. In which part of the cell are these chromosomes replicated during the cell cycle?
Select ONE correct answer.
Which table best compares the events that occur during different stages of the cell cycle?
Cells pass through a G2 checkpoint before entering mitosis. Ideally, if DNA damage is detected, the cells do not enter mitosis until the damage is repaired.
Why is DNA damage repaired before cells enter mitosis?
Scientists determine the total mass of DNA from a sample of animal cells. The masses of equal numbers of cells were taken during three different stages of the cell cycle. Stage I contains cells massed during G1 of the cell cycle.
Which statement best describes the cells during Stage II?
A student observed a human cheek cell under a light microscope and made these observations:
The chromatin is condensed.
There is no visible nucleolus.
The spindle fibers are visible.
The nuclear membrane looks like it is disappearing.
Which phase of the cell cycle is the student MOST LIKELY observing?
The diagram below illustrates the steps of DNA Replication.
What is the purpose of DNA Replication?
In Texas Longhorn cattle, coat coloration is an inherited trait.
What is the genetic basis of coat-color variation (differences) in Texas Longhorn cattle?
A model of DNA is shown.
Which part of the DNA model is most directly associated with the coding of genetic information?
A model of DNA structure is shown.
Select the option that correctly labels the diagram, in order from 1–4.
Scientists have long theorized about the origins of the DNA molecule. Where do scientists think that DNA originated from?
A model of an enzyme and its corresponding substrate is shown.
Which model best represents the interaction between the enzyme and the substrate to form multiple products?
Students were investigating unknown cells found in a sample of water. The table summarized their observations of the cells.
The students are trying to determine which type of cell evolved first. Which statement below BEST describes the cell that evolved first?
