Question 1

Which of the following statements best summarizes the cell theory and its implications for biological research?

Accepted Answer

All living organisms are composed of cells, and all cells arise from pre-existing cells, making cells the fundamental unit of life.

Question 2

A scientist is comparing eukaryotic and prokaryotic cells. Which feature is present in both cell types?

Accepted Answer

Presence of DNA

Question 3

A hypothesis in scientific research must meet which of the following criteria?

Accepted Answer

It must be an explanation based on observations and assumptions that leads to a testable prediction.

Question 4

A double-stranded DNA molecule contains three guanine and five thymine nucleotides in the 5' to 3' strand. How many nucleotides are present in total?

Accepted Answer

16

Question 5

If a substance has a pH of 5, how many times more acidic is it compared to a substance with a pH of 8? Use the formula $	ext{Acidity difference} = 10^{|pH_1 - pH_2|}$.

Accepted Answer

$1000$

Question 6

Which property of water allows dogs to cool themselves by panting, and what is the underlying mechanism?

Accepted Answer

Water’s high heat of vaporization; it enables evaporative cooling as water absorbs heat when it changes from liquid to vapor.

Question 7

A mighty tree, 100 feet tall, is able to bring water from its roots to its leaves. Which forces are primarily responsible for this process?

Accepted Answer

Adhesion and cohesion

Question 8

Why do coastal regions near large bodies of water experience less drastic temperature changes than inland areas?

Accepted Answer

Because water bodies have a high specific heat exchange capacity acting as a temperature buffer.

Question 9

Which functional group would cause a molecule such as citric acid to be acidic?

Accepted Answer

Carboxyl

Question 10

During the synthesis of macromolecules, which type of reaction is used to join monomers together?

Accepted Answer

Dehydration synthesis

Question 11

Which macromolecule utilizes a dehydration reaction during synthesis?

Accepted Answer

All of the above

Question 12

Hydrogenating fats results in which of the following changes?

Accepted Answer

None of the above

Question 13

Which of the following is a characteristic of eukaryotic cells but not prokaryotic cells?

Accepted Answer

Presence of membrane-bound organelles

Question 14

Which organelle is involved in sorting and packaging materials for transport within and outside the cell?

Accepted Answer

Golgi apparatus

Question 15

Which kind of microscope would you need to visualize proteins that are smaller than a ribosome?

Accepted Answer

Electron microscope

Question 16

A biuret test is performed in the laboratory. What type of macromolecule does the biuret test primarily detect, and what color change indicates a positive result?

Accepted Answer

Proteins, from blue to purple

Question 17

Enzyme activity is investigated in a lab. What happens to enzyme activity as temperature increases beyond the optimal range, and what is the term for this phenomenon?

Accepted Answer

Enzyme activity decreases; it's called denaturation

Question 18

If you were studying mutant cells and found that many proteins are going to the wrong compartments in these cells, which organelle is most likely affected?

Accepted Answer

Endoplasmic reticulum

Question 19

Which of the following is a functional group that would cause a molecule to be more hydrophobic?

Accepted Answer

Hydrocarbon

Biology 101 Exam Study Guide

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