Unit 4 Quiz 2
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
Cyanide inhibits mitochondrial function; as a result, the rate of
ATP synthesis decreases
Which of the following statements regarding cells is false?
All cells have a cell wall.
Much of the intracellular structure of a eukaryote cell is involved in protein synthesis. The accompanying figure shows the amounts of protein in cells at different parts of the cell cycle between two cell divisions. G 1 is a stage just after the cell has divided, and G 2 is the stage just before the cell divides again. S is a stage when the cell is synthesizing material such as DNA, mitochondria, and other organelles.
Cells export a large amount of protein following cell division.
Which of the following statements about lysosomes is false?
Lysosomes synthesize proteins from the recycled amino acids.
Which of the following statements about plant cell walls is false?
Plant cell walls protect plant cells by forming an impermeable layer around the cell.
Which of the following statements regarding plasmodesmata is false?
Plasmodesmata are found in plants and animals.
Which of the following statements about the functions of a plant cell central vacuole is false?
The central vacuole of a plant cell may digest chemicals for recycling.
Which of the following statements regarding the endomembrane system is false?
The endomembrane system is a system of interrelated membranes that are all physically connected
The endosymbiosis hypothesis proposes that
a small cell lived inside a larger cell to the benefit of both cells.
Skin cells are fastened into strong sheets by
anchoring junctions.
Cilia differ from flagella in that
cilia are typically more numerous and shorter than flagella.
Mitochondria differ from chloroplasts in that mitochondria
contain membrane folds called cristae, whereas chloroplasts contain disklike vesicles in stacks called grana
The nucleus of a cell
contains DNA.
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.
The endosymbiosis hypothesis is supported by all of the following pieces of evidence except the fact that
mitochondria lack ribosomes like prokaryotes.
The endomembrane system includes all of the following organelles except the
peroxisome.
Contractile vacuoles
prevent cells from bursting as a result of the influx of excess water.
Hexokinase is an enzyme that is involved with glycolysis (the breakdown of glucose for energy release) that occurs in the cytoplasm. What cellular structure makes hexokinase?
ribosomes
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 cells that produce hair made of protein contain a lot of ________, while the cells that produce the oils that coat the hair contain a lot of ________.
rough endoplasmic reticulum; smooth endoplasmic reticulum
Smooth endoplasmic reticulum
stores calcium ions in muscle cells.
Intermediate filaments
surround the nucleus.
A drug that interferes with microtubule formation is likely to completely disrupt
the movements of sperm cells.
An immune system cell called the plasma cell produces thousands of antibodies (a type of protein) per second for release into the body. What type of intracellular structure would you expect to be very prominent within the cell?
the rough endoplasmic reticulum
