Exam 6: Cell Structure and Internal Compartments

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?

The definition of life is somewhat arbitrary; the critical aspect(s)that currently define(s)cells as living structures is (are)

Cilia are usually thicker and longer than flagella.

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

A ribosome has internal cristae.

The cell in the figure below is moving by producing pseudopodia. This type of movement is a result of the reorganization of a certain component of the cytoskeleton (labeled). The various labeled lines in the figure above show

Ribosomes are very small nonmembranous organelles associated with the synthesis of

____________________ are the part of the cytoskeleton that provides mechanical strength to cells and reinforces the membranes of organelles.

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

Which of the following statements is false?

Chemical reactions occur more efficiently in ____________________ because their reactants are concentrated within a specialized compartment.

Organisms whose cells lack internal membrane-bound organelles are classified as ____________________.

The sizes of several biological structures are indicated in the figure below. Which of the following is the smallest structure you could see with a light microscope?

Microtubules are composed of tubulin monomers.

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

Which statement best describes the relationship between cell surface area, volume, and average width or radius?

Imagine examining a cell using a light microscope; a prokarotye could be distinguished from a eukaryote by the absence of

Until recently public health officials had mistakenly believed that the mosquitoes responsible for transmitting malaria primarily live indoors, and thus officials had concentrated eradication efforts on dwellings.

That multicellularity _____ provides strong evidence of its adaptive value.

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?