問題一覧
1
Which type of bonds hold two or more water molecules together?
Hydrogen bonds
2
Which type of biomolecule stores genetic information?
Nucleic acids
3
Which type of biomolecule regulates cell processes or transports material into and out of cells?
Proteins
4
An enzyme speeds up a reaction by:
Lowering the activation energy
5
Despite differences in size and shape, at some point all prokaryotic and eukaryotic cells have DNA and a:
Cell membrane
6
The organelles that break down lipids, carbohydrates, and proteins into small molecules that can be used by the cell are called:
Lysosomes
7
The cellular structure that distinguishes a prokaryotic cell from a eukaryotic cell is the presence of:
A nucleus
8
A substance that moves by passive transport tends to move:
Away from the area where it is more concentrated
9
Which type of organism consists of specialized cells?
Multicellular eukaryotes
10
What is the relationship among solutions, solutes, and solvents?
Solutes dissolve in solvents to form solutions
11
What changes to the environment can affect the activity of enzymes?
Temperature, pH, and substrate concentration
12
What is the name for the amount of energy that a reaction needs to get started?
Activation energy
13
How do enzymes act as catalysts in a chemical reaction?
By lowering the activation energy
14
What is the function of the cytoskeleton?
To provide structural support and shape for the cell
15
What is the main difference between passive transport and active transport of materials across a cell membrane?
Active transport requires energy, while passive transport does not
16
In what way does specialization of cells contribute to maintaining homeostasis in multicellular organisms?
Different cells perform different tasks, helping maintain balance
17
How are endocytosis and exocytosis different from each other?
Endocytosis is the process of taking material into the cell, while exocytosis is the process of releasing material from the cell
18
Which of the following is not a function of the cell membrane?
Storing genetic information
19
What are the two major components of the cell membrane, and what model describes their arrangement?
Lipids and proteins, the fluid mosaic model
20
How are lipids oriented in the cell membrane, based on the hydrophilic and hydrophobic parts of the molecules?
The hydrophilic heads face outward, and the hydrophobic tails face inward