Bio Exam 1

Front 1

The partial negative charge at one end of a water molecule is attracted to the partial positive charge of another water molecule. What is this attraction called?

Back 1

A hydrogen bond

Front 2

Which of the following effects cab occur because of the high surface tension of water?

Back 2

A raft spider can walk across the surface of a small pond

Front 3

Which type of bond must be broken for water to vaporize?

Back 3

Hydrogen bonds

Front 4

Consider the following reaction at equilibrium. CO2+H2OH2CO3. What would be the effect of adding additional H2CO3?

Back 4

It would drive the equilibrium dynamics to the left.

Front 5

Which of the following solutions would require the addition of the greatest amount of base to bring the solution to neutral pH?

Back 5

Gastric juice at pH 2.

Front 6

One of the buffers that contribute to pH stability in human blood is carbonic acid. Carbonic acid is a weak acid that,when placed in an aqueous solution,dissociates into a bicarbonate ion and a hydrogen ion. If the pH of blood increases,one would expect _____

Back 6

A decrease in the concentration of H2CO3 and an increase in the concentration of HCO3-

Front 7

If the cytoplasm of a cell is at pH 7,and the mitochondria matrix is at pH 8,the the concentration of H+ ions _____

Back 7

Is 10 times higher in the cytoplasm than in the mitochondrial matrix

Front 8

In living systems molecules involved in hydrogen bonding almost always contain either oxygen or nitrogen or both. How do you explain this phenomenon?

Back 8

Oxygen and nitrogen are elements with very high attractions for their electrons.

Front 9

Which of the following is true of metabolism in its entirety in all organisms?

Back 9

Metabolism consists of all the energy transformation reactions in an organism.

Front 10

Most cells cannot harness heat to perform work because ____

Back 10

Temperature is usually uniform throughout a cell

Front 11

Which term most precisely describes the cellular process of breaking down large molecules into smaller ones?

Back 11

Catabolism(catabolic pathways)

Front 12

Anabolic pathways ___

Back 12

Consume energy to build polymers from monomers

Front 13

Which of the following is a statement of the first law of thermodynamics?

Back 13

Energy cannot be created or destroyed

Front 14

For living organisms,which of the following is an important consequence of the first law of thermodynamics?

Back 14

The organism ultimately must obtain all of the necessary energy for life from its environment

Front 15

Why is ATP an important molecule in metabolism?

Back 15

It provides energy coupling between exergonic and endergonic reactions

Front 16

Which of the following is the most correct interpretation of the figure?

Back 16

ATP is a molecule that acts as an intermediary to store energy for cellular work

Front 17

The active site of an enzyme is the region that ___

Back 17

Is involved in the catalytic reaction of the enzyme

Front 18

A uncompetitive inhibitor decreases the rate of an enzyme reaction by ___

Back 18

Changing the shape of the enzyme's active site by using an allosteric site

Front 19

How might a change of one amino acid at a site,distant from the active site of an enzyme,alter an enzymes's substrate specificity?

Back 19

By changing the shape of an enzyme

Front 20

Which of these classes of biological molecules does NOT include polymers?

Back 20

Lipids

Front 21

Which of the following g best summarizes the relationship between dehydration reactions and hydrolysis?

Back 21

Dehydration reactions assemble polymers;hydrolysis reactions break polymers apart

Front 22

How is lactose classified?

Back 22

Disaccharide

Front 23

Molecule shown in the accompanying figure is

Back 23

A hexose

Front 24

Best explanation for why vegetable oil is a lquid at room temperature while animal fats are solid

Back 24

Vegetable oil has more double bonds than animal fats

Front 25

Molecule shown in the accompanying figure is a

Back 25

Steroid

Front 26

The tertiary structure of a protein is the __

Back 26

Unique 3D shape of the fully folded polypeptide

Front 27

Which term is used for a protein molecule that assists in the proper folding of other proteins?

Back 27

Chaperonin

Front 28

Best fits the class of molecules known as nucleotides?

Back 28

A nitrogenous base,a phosphate group,and a sugar

Front 29

5'ATTGCA3'

Back 29

5'TGCAAT3'

Front 30

True of carbon

Back 30

It can form both polar and nonpolar bonds

Front 31

A carbon atom is most likely to form what kind of bonds with other atoms?

Back 31

Covalent

Front 32

Correctly describes cis-trans isomers?

Back 32

They have variations in arrangement around a double bond.

Front 33

A hydroxarbob chain with the same number of carbon atoms,but with one orbmore double bonds,will_____

Back 33

Be more constrained in structure

Front 34

The 2 molecules shown in he figure are best described as___

Back 34

Structural isomers

Front 35

The two molecules shown in the figure below are best described as___

Back 35

Cis-trans isomers

Front 36

Testosterone and estradiol are male and femail sex hormones. In what ways do these molecules differ from each other?

Back 36

Have different functional groups attached to the same carbon skeleton

Front 37

Which of the following is a false statement concerning amino groups?

Back 37

Are nonpolar

Front 38

When oxygen is released as a result of photosynthesis,it is a direct by-product of ___

Back 38

Splitting water molecules

Front 39

Why are there several structurally different pigments in the reaction centers of photosystems?

Back 39

This arrangement enables the plant to absorb light energy of a variety of wavelengths

Front 40

What event accompanies energy absorption by chlorophyll?

Back 40

An electron is excited