Biology practice test 1406

ATP

(adenosine triphosphate) main energy source that cells use for most of their work

ATP

Adenosine Tri -Phosphate stores and transfers engery within the cell

An allosteric enzyme:

Allows a substance other than the substrate to bind to the enzyme in a site remote to the active site, thereby activating or inactivating it.

The equation, G=H-TS, predicts that:

As entropy increases, the amount of free energy decreases

Which of the following is not a cell covering or part of an animal cell covering? gycocalyx, collagen, cell membrane, integrins, capsule

Capsule

Because enzymes affect the speed of chemical reactions without being consumed, they are referred to as:

Catalysts

Which cell structure would not be in a prokaryotic cell, but would be found in a eukaryotic cell? cell wall, flagellum, ribosomes, golgi complex, DNA

Golgi complex

Nucleoli contain chromosomal regions that specialize in making:

RNA

Which scientist first viewed cells?

Robert Hooke

All of the following functions are performed by plant vacuoles except: maintaining hydrostatic (turgor) pressure waste storage and recycling storage of proteins breakdown of unneeded cellular materials storage of nucleic acids

Storage of nucleic acids

Which of the following is not found in single celled organisms?

Tissues

eukaryotic

a type of cell with a membrane-enclosed nucleus and membrane-enclosed organelles. Organisms with eukaryotic cells are called eukaryotes.

Parts of the enzyme molecule that interact with a substrate are called:

active sites

A cellular structure found in plant but not animal cells is the:

cell wall

Integral proteins

amphipathic

The equation, G=H-TS, predicts that:

as entropy increases, the amount of free energy decreases

DNA is associated with proteins, forming a complex known as:

chromatin

Which of the following is a typical component of eukaryotic cell membranes?

cholesterol

Which of the following is a typical component of eukaryotic cell membranes? DNA, glucose, cholesterol, water, All the above

cholesterol

Most of the time, DNA in the nucleus of a eukaryotic cell appears loosely arranged forming a complex known as:

chromatin

Which word is defined by this statement: a measure of this disorder, or randomness?

entropy

The reaction ATP+H20 r ADP+Pi is classified as an:

exergonic reaction

Plasmodesmata of plant cells are functionally equivalent to ________ of animal cells.

gap junctions

A eukaryotic cell

has a variety of membranous organelles

If the concentrate of solutes in a cell is less than the concentration of solutes in the surrounding fluid, then the extracellular fluid is said to be:

hypertonic

Amphipathic

if something is BOTH polar and nonpolar, it is________

Pinocytosis

is the nonspecific uptake of fluids by an invagination of the cell membrane

Enzymes are important biological catalysts because they:

lower the activation energy of a biochemical reaction

The sum of all chemical activities taking place in an organism is:

metabolism

Which of the following is a key component of the cytoskeleton? membranes, microtubules, DNA, ribosomes, None of the above

microtubules

Which of the following structures or activities is not directly part of the endomembrane system? budding, lysomes, mitochondria, nuclear membrane, golgi complex

mitochondria

Which of the following pairs is correctly matched?

nucleolus-site of ribosomal subunit synthesis

If a toxin, such as a bacterial toxin, destroys ribosomes, what cellular activity will be affected first?

protein synthesis

The substance on which an enzyme acts:

substrate

Catabolic reactions involve the:

the breakdown of large organic molecules to simple building blocks

A plant cell placed in a hypertonic solution will:

undergo plasmolysis