Question 1

Which of the following statements about ammonia ($\mathrm{NH_3}$) is correct, given that nitrogen (N) is much more electronegative than hydrogen (H)?

Accepted Answer

Each hydrogen atom has a partial positive charge.

Question 2

When the pH of a solution shifts from 7 to 3, how has the hydrogen ion concentration changed?

Accepted Answer

It has increased by 10,000 times.

Question 3

Citric acid makes lemons taste sour. Which of the following is a functional group that would cause a molecule like citric acid to be acidic?

Accepted Answer

carboxyl

Question 4

Monosaccharides are linked to one another to form a polysaccharide by which process?

Accepted Answer

splitting out H and OH, which form water

Question 5

A DNA strand contains which of the following?

Accepted Answer

the nitrogenous bases adenine, guanine, cytosine, or thymine

Question 6

A temperate phage is best described as:

Accepted Answer

A phage capable of a lysogenic and lytic cycle.

Question 7

Which of the following changes might occur if the primary structure of a protein is altered?

Accepted Answer

All the above are possible.

Question 8

Exergonic reactions:

Accepted Answer

release energy as a by-product.

Question 9

Which of the following would decrease the entropy within a system?

Accepted Answer

dehydration reaction

Question 10

The rate of an enzyme-catalyzed reaction is reduced at low temperatures because:

Accepted Answer

there is not enough energy in the system for the reaction to proceed.

Question 11

Which of the following statements describes a way in which Cell A and Cell B are similar?

Accepted Answer

they both have nuclei.

Question 12

Which of the following is an emergent property?

Accepted Answer

A multicellular organism can perform functions that its individual cells cannot.

Question 13

Increasing substrate concentration in an enzymatic reaction could overcome which of the following?

Accepted Answer

competitive inhibition

Question 14

The activation energy of an enzyme-catalyzed reaction is:

Accepted Answer

less than that of the uncatalyzed reaction.

Question 15

ATP generally activates a cellular process by:

Accepted Answer

direct chemical transfer of a phosphate group.

Question 16

In the 3-Domain system of classification, organisms that do not contain a nucleus are represented by:

Accepted Answer

archaea and bacteria.

Question 17

A covalent bond is the result of:

Accepted Answer

two atoms that are sharing a pair of valence electrons.

Question 18

There are four levels of protein structure. Which level of structure contains coils and folds called $\alpha$-helices and $\beta$-pleated sheets?

Accepted Answer

secondary

Question 19

Which of the following statements is true about cellular membranes?

Accepted Answer

Phospholipids are spread in a continuous layer over both surfaces of the membrane.

Question 20

Which of the following statements is true about anabolic pathways?

Accepted Answer

They combine molecules into more complex and energy-rich molecules.

General Biology: Core Concepts and Practice Questions

Study Guide - Practice Questions