Exam 3: Cell Structure and Internal Compartments

Prokaryotes and eukaryotes are primarily distinguished by the absence or presence of internal,membrane-bound organelles.Are prokaryotic cells at an evolutionary disadvantage because they lack organelles?

Protists use cilia to move within their habitat,but ciliated human cells like those in the bronchi are always anchored to one another and to an extracellular matrix;what benefit does cilia provide these cells?

Lysosomes are organelles responsible for the breakdown of macromolecules.Why is it useful to have the lysosomal reactions compartmentalized,rather than allowing them to take place freely in the cytoplasm of the cell?

The hydrophobic portions of a membrane's phospholipid bilayer are oriented toward the interior of the membrane and pointed away from aqueous environments.

Microtubules are composed of tubulin monomers.

The movements of wound-healing fibroblasts in your body depend on pseudopodia that can extend and retract,because the microfilaments in them can rapidly change their length.

The boundary that surrounds the contents of the nucleus is the

Which of the following is NOT a function of the plant vacuole?

Eukaryotic cells contain membrane-bound organelles.

The plasma membrane of a cell and the membrane boundaries of organelles,such as mitochondria and chloroplasts,serve similar functions.What is one of the main functions of the membranes of both cells and organelles?

Which of the following statements about mitochondria and chloroplasts is FALSE?

Using an electron microscope,you notice an organelle that consists of stacks of membranes and appears to be producing vesicles.This organelle is most likely

In eukaryotic cells,most of the ATP used for cellular reactions is produced by the specialized,membrane-enclosed compartments known as ________.

Which of the following statements is FALSE?

A membrane that is selectively permeable causes damage to the cell by allowing solutes to enter and leave the cell indiscriminately.

A microscope is used to obtain a magnified view of an object.

The microfilaments that allow cells to move contain the protein ________.

The entire contents of a cell,except for the nucleus,are included in the ________.

DNA from which listed organelle is inherited from a child's mother?

The relative abundance of a specific organelle is often predictable when cell function is considered;for example,more lysosomes than those found in an average cell could be expected to be found in