A child dies following a series of chronic bacterial infections. At the autopsy, the physicians are startled to see that the child's white blood cells are loaded with vacuoles containing intact bacteria. Which of the following explanations could account for this finding?
A defect in the lysosomes of the white blood cells prevented the cells from destroying engulfed bacteria.
Which of the following statements about the cytoskeleton is false?
Once laid down, the elements of the cytoskeleton are fixed and remain permanently in place.
Which of the following statements regarding cells is false?
All cells have a cell wall
The function of chloroplasts is
A scientist wants to examine living cells lining the respiratory tract to determine how the cells use tiny hairs to move dirt and mucus away from the lungs. Which of the following instruments would be best, and why?
a light microscope because it allows observations of whole, live cells
Which of the following statements about cellular metabolism (the breaking down & building of molecules) is false?
Cellular metabolism occurs in animal but not plant cells
Which of the following structures is exclusively associated with prokaryotic cells?
Long fibers of DNA and protein are called
The idea that all living things are composed of cells and that all cells come from other cells defines
Cilia differ from flagella in that
cilia are typically more numerous andshorter than flagella
A manufacturing company dumps its wastes into a nearby pond. One of the wastes is found to paralyze the contractile vacuoles of certain protists. A biologist looking at individual samples of these organisms taken from the pond would find that they
have gained water and burst
Your throat is dry, and you want the last cough drop in the box to last a long time in your mouth. What should you do?
Keep the cough drop whole.
________ cells lack a membrane-enclosed nucleus.
Which of the following structures are used by prokaryotes for attaching to surfaces?
Archaea are composed of _______ cells
Insulin is a protein that is produced by pancreatic cells and secreted into the bloodstream. Which of the following options correctly lists the order of the structures through which insulin passes from its production to its exit from the cell?
rough ER, transport vesicles, Golgi apparatus, transport vesicles, cell membrane
The nucleoid region of a prokaryotic cell
contains the cell's DNA
The diameter of most animal and plant cells ranges from
10 to 100 micrometers
The nucleus of a cell
The cells that produce hair contain a lot of ______, while the cells that produce the oils that coat the hair contain a lot of _______.