Biology Chapter 11 TEST

What structure is found in prokaryotic cells but not eukaryotic cells?

A single, circular DNA chromosome found in the cytoplasm

The p53 protein is involved in DNA repair and in triggering cell death when repair is not possible. Why are some cancers associated with defective p53 genes? Select all that apply.

Because cells with damaged DNA grow and divide uncontrollably/Because cells with damanged DNA are not triggered to die/Because cell growth and division is no longer regulated by p53 protein

If the side of a cubical cell is doubles, what would the cell then require? Select all of the correct answers.

Eight times more nutrients/To excrete eight times more waste

A physician takes a tissue sample from a patient and studies it under a microscope. Which of the following observations is the STRONGEST indication that there are cancer cells in the tissue sample?

Many cells are non-differentiated and are clustered together

Before stem cell therapies can be ethically approved for other conditions, which safety assessments should be confirmed? Select all the answers that apply.

Stem cells should not have harmful mutations/Stem cells should not have spread beyond the site of the transplant/Stem cell treatment should not cause tumors

A scientist is studying the cells of an animal, and concludes that many cells are dying in a process of apoptosis. Which is the most reasonable explanation for the scientist's conclusion?

The animal may be healthy, because cell deaths are part of normal body activities

Which observation would provide the STRONGEST evidence that Paramecium reproduces asexually?

The cells in the colony are genetically identical

Which of the following happens when cancer occurs?

The control of the cell cycle is impaired

How are the iPS cells that the researchers developed different from embryonic stem cells that form naturally?

The iPS cells were made from differentiated cells

In a cubical cell with 2-cm sides doubles the dimensions of its size, what change occurs to the ratio of its surface area to volume

The ratio is halved

Which of the following statements are typical for cancer cells? Select all that apply.

They tend to be unspecialized/They may form tumors that metastasize/They have defective genes

What useful purpose is served by cell division in a multicellular organism? Select all the correct answers.

To ensure that a cell does not become too large/To produce new cells during an organism's growth/To replace damaged cells and tissues