etH - hayflick, gene therepy, telomeres 2.6.24

repetitive DNA at the end of a eukaryotic chromosome is a __________.

• bacteriophage
• DNA polymerase
• nitrogenous base
• telomere

Why do lobsters die (according to the video)?

• they die from genetic mutation

• they die of old age

• they die because their telomeres break down quickly

• they die from being eaten

What purpose do telomeres serve? (select all answers that apply)

• they protect the ends of chromosomes

• they hold chromosomes together

• they code for proteins

• they are chunks of useless DNA

Cells with long telomeres on their chromosomes could be (select all that apply)

• cancerous

• have high telomerase activity

• young

• old

What can cancer cells do that normal cells cannot?

• they do everything the same

• they regenerate their telomeres, preventing them from aging

• they go through cellular division

• they grow

How many more copies of p53 gene do elephants have compared to humans?

• 2 times

• 40 times

• 20 times

• 10 times

What is the relationship between cancer rates and the body mass of animals?

• The larger the animals the higher the cancer rates

• The smaller the animal the lower the cancer rates

• There is no correlation between cancer rates and body size

• The small the animal the higher the cancer rates

The Hayflick limit involves

• the size a cell can reach before dividing

• a cell dividing about 50 times before it reaches senescence

• telomeres lengthening with each cell division

• None of the choices

True/False: the more copies of p53 an organism has the more likely they will develop cancer.

• True

• False

In a healthy cell, if p53 identifies a mutation in the DNA of a cell it will

• destroy it

• not allow it to move to the next phase until it is repaired

• allow the cell to continue dividing

• attack and destroy the DNA