Cells and Body Systems Review

Which section is not part of the cell theory?

• Cells are the structural units in living things.

• Cells are the functional units in living things.

• New cells arise from preexisting cells.

• New cells have nuclei identical to those of preexisting cells.

The diagnostic test for HIV, the virus that causes AIDS, involves testing the blood for antibodies associated with this pathogen. Antibodies are produced when the body...

• stimulates enzyme production

• secretes specific hormones

• detects foreign antigens

• synthesizes microbes

Which statement is an example of a feedback mechanism in humans?

• An increase in the level of blood sugar results in the pancreas increasing the amount of insulin it secretes.

• Increased exposure to pathogenic bacteria results in an increase in the number of red blood cells produced.

• An increase in exercise results in a decrease in the rate of respiration.

• Increased muscle activity results in a decrease in heart rate.

Which cell structure is mainly responsible for releasing energy from food molecules in some single-celled organisms?

• ribosome

• chloroplast

• cell membrane

• mitochondrion

The process of osmosis would explain the net movement of water into a cell if the percentage of...

• water was 90% inside the cell and 95% outside the cell

• protein was 30% inside the cell and 35% outside the cell

• water was 95% inside the cell and 90% outside the cell

• water and protein was equal inside and outside the cell

In single-celled organisms, materials are stored primarily in...

• ribosomes

• mitochondria

• nuclei

• vacuoles

When the bag is placed into the beaker, water will...

• move OUT of the bag, causing the bag to shrink

• move OUT of the bag, causing the bag to swell

• move INTO the bag, causing the bag to shrink

• move INTO the bag, causing the bag to swell

One primary function of the cell membrane is...

• regulating the flow of simple sugars into or out of the cell

• synthesizing substances by breaking down cell organelles

• storing carbohydrates, water, and starches for future use

• digesting carbohydrates, fats, and protein

Which statement concerning the structures within this cell is accurate?

• Structure 1 is a chloroplast that carries out photosynthesis.

• Structure 2 is a vacuole that contains DNA.

• Structure 3 is a mitochondrion, where respiration takes place.

• Structure 4 is the cell membrane, which provides rigid support for the cell.

Some viruses attack cells by attaching to their outer covering, entering, and taking over their genetic “machinery.” Viruses are able to invade cells after first attaching to their...

• nuclear membrane

• cell membrane

• genetic machinery

• viral proteins