Question 1

In an experiment, three essays are tested for reaction rate. The first essay contains no enzyme, the second contains enzyme, and the third contains twice as much enzyme as the second. What is the dependent variable in this experiment?

Accepted Answer

The reaction rate.

Question 2

Which of the following is the independent variable in the enzyme experiment described above?

Accepted Answer

The amount of enzyme added.

Question 3

A polar covalent bond is due to:

Accepted Answer

Unequal sharing of valence electrons between two atoms.

Question 4

The measure of the affinity of an atom's nucleus for electrons is referred to as:

Accepted Answer

Electronegativity.

Question 5

Given the molecule $$\mathrm{H_2O}$$, how many hydrogen bonds can a single water molecule form with other water molecules?

Accepted Answer

Four — hydrogen bonds

Question 6

Which of the following molecules would be classified as 'amphipathic'?

Accepted Answer

A molecule with both hydrophobic and hydrophilic regions.

Question 7

Which of the following interactions does NOT play a role in forming the tertiary structure of a protein?

Accepted Answer

Glycosidic linkages

Question 8

Quaternary structure of proteins refers to:

Accepted Answer

The number of polypeptide subunits that are attached to the protein.

Question 9

Which of the following amino acids is classified as non-polar?

Accepted Answer

Leucine

Question 10

Which of the following is an immune response that is typical of the adaptive immune system?

Accepted Answer

Recognition of infected cells by cytotoxic T cells.

Question 11

Consider the structure of a phospholipid bilayer. Region 1 is the head group and region 2 is the fatty acid tail. Which statement is correct?

Accepted Answer

Region 1 is hydrophilic and would form the surface of a cell membrane; region 2 is hydrophobic and would form the interior.

Question 12

Which molecule in Figure 4.7 contains a carboxyl functional group?

Accepted Answer

Molecule A

Question 13

Which molecule in Figure 4.7 contains a hydroxyl functional group?

Accepted Answer

Molecule C

Question 14

Which of the following statements about dehydration reactions is FALSE?

Accepted Answer

They consume water as a reactant.

Question 15

Which of the molecules shown is a form of carbohydrate energy storage in plants (in the form of starch/amylopectin)?

Accepted Answer

Molecule A

Question 16

Which of the molecules is the primary form of energy storage in adipose tissue?

Accepted Answer

Molecule C

Question 17

In the formation of a triglyceride from the components shown (1 and 2), how many molecules of water are produced?

Accepted Answer

3

Question 18

One base pair of a DNA double strand is shown below. What two bases are involved in this pair?

Accepted Answer

C-G

Question 19

DNA with a higher $$\% G + C $$content is more stable at high temperatures than DNA with a high $$\% A + T $$content. Why?

Accepted Answer

The hydrogen bonds between G and C are stronger than those between A and T.

Question 20

What is the nucleotide sequence of the complementary strand of the DNA molecule $$5'	ext{-}ATGCCGA-3'$$?

Accepted Answer

$$3'	ext{-}TACGGCT-5'$$

General Biology: Biomolecules, Chemical Bonds, and Macromolecular Structure

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