Question 1

Which property of water allows it to move upward through the xylem of plants during transpiration?

Accepted Answer

Cohesion and adhesion

Question 2

A scientist is analyzing a graph showing the average height of plants grown with different fertilizers. The error bars represent standard deviation. What does it mean if the error bars for two groups do not overlap?

Accepted Answer

There is likely a statistically significant difference between the groups.

Question 3

Which of the following best describes the difference between hydrolysis and dehydration synthesis?

Accepted Answer

Hydrolysis breaks polymers by adding water; dehydration synthesis joins monomers by removing water.

Question 4

Which of the following is true about the primary structure of a protein?

Accepted Answer

It refers to the sequence of amino acids in a polypeptide chain.

Question 5

A mutation causes a single amino acid substitution in a protein. Which level(s) of protein structure could be affected?

Accepted Answer

Primary, secondary, and tertiary structures

Question 6

Which of the following best explains why ice floats on liquid water?

Accepted Answer

Hydrogen bonds in ice create a lattice that is less dense than liquid water.

Question 7

Which of the following is a correct pairing of a nitrogenous base with its complementary base in DNA?

Accepted Answer

Cytosine and guanine

Question 8

Which of the following best describes the structure and behavior of phospholipids in a cell membrane?

Accepted Answer

Phospholipids form a bilayer with hydrophilic heads facing outward and hydrophobic tails facing inward.

Question 9

Which of the following statements about glucose, galactose, and fructose is correct?

Accepted Answer

They are structural isomers with the same molecular formula $$C_6H_{12}O_6$.

Question 10

A researcher is designing an experiment to test the effect of temperature on enzyme activity. Which is the dependent variable?

Accepted Answer

The rate of enzyme activity

Question 11

Which of the following best explains why water is considered a universal solvent?

Accepted Answer

Water's polarity allows it to dissolve many ionic and polar substances.

Question 12

Which of the following is NOT a correct pairing of a macromolecule with its building block?

Accepted Answer

Lipids – nucleotides

Question 13

Which element is found in all proteins but not in carbohydrates or lipids?

Accepted Answer

Nitrogen

Question 14

A protein is exposed to high heat and loses its three-dimensional shape. What is the most likely result?

Accepted Answer

The protein will become denatured and lose its function.

Question 15

Which of the following best describes the difference between hydrophilic and hydrophobic R groups in amino acids?

Accepted Answer

Hydrophobic R groups are nonpolar and avoid water.

Question 16

Which sugar forms the backbone of DNA?

Accepted Answer

Deoxyribose

Question 17

A student is analyzing a data set and calculates a standard deviation of zero. What does this indicate about the data?

Accepted Answer

All data points are identical.

Question 18

Which of the following best describes the quaternary structure of a protein?

Accepted Answer

The association of multiple polypeptide chains into a functional protein

Question 19

Which of the following is an example of an organic compound?

Accepted Answer

C_6H_{12}$$O_6$$

Question 20

Which of the following best explains the role of hydrogen bonds in the structure of water?

Accepted Answer

Hydrogen bonds hold water molecules together, giving water its cohesive properties.

Unit 1 Study Guide: Water, Biomolecules, and Biological Chemistry

Guida di studio - Domande di pratica

Study guide - Flashcard