問題一覧
1
Students want to find the minimum concentration of bleach and water solutions that will control algal growth in the pond. Which procedure best enables the students to effectively test all the bleach concentrations against a control.
Set up four small jars with equal portions of algae, and add each different bleach concentration of three of the jars.
2
An important organelle found in eukaryotic cells produces ribosomal subunits from proteins and ribosomal RNA, also known as rRNA. It then sends the subunits out to the rest of the cell where they combine into complete ribosomes. Ribosomes make proteins; therefore, this organelle plays a vital role in making proteins in the cell. What is this organelle?
Nucleolus
3
Which macromolecule is the main component of the cell membrane?
Lipids
4
Which of the following accurately describes diffusion?
The passive movement of molecules from a high concentration to a low concentration
5
In which organelle does storage take place?
Central vacuole
6
A diagram of a cell is shown. Proteins are synthesized in which numbered organelle?
3
7
The plasma membrane is considered a semi-permeable because
All of the above
8
Which type of vesicle contains enzymes that detoxify alcohol and other drugs, produce hydrogen peroxide, breakdown fatty acids, and kill bacteria?
peroxisome
9
Which cell process requires energy expenditure?
Phagocytosis
10
Which cell organelle contains enzymes that are necessary for intracellular digestion?
Lysosomes
11
What structures is found in both prokaryotic and eukaryotic cells?
Ribosome
12
Active transport occurs in cells, for example, when the Na-K pump is at work. Any process that involves active transport most often involves the
Movement of molecules from a lower concentration to a higher concentration
13
The smooth ER is especially abundant in cells that synthesize extensive amounts of
Lipids like hormones and cholesterol
14
Nucleotides are a structural component of which macromolecule?
Nucleic acids
15
The phospholipid bilayer is mainly made of ____________ and one of its primary jobs is to _________
lipids, protect and support the cell
16
Proteins function as enzymes, antibodies and in cell communication. Which of the following is the building block of proteins?
b
17
The cell membrane regulates the movement of molecules in and out of the cell. Which best describes the cellular environment that initiates the passive transport of molecules across the cell membrane?
A concentration gradient across the cell membrane
18
Protein channels that allow larger molecules passage through the cell membrane are comprised of
Amino acids
19
If stranded on a deserted island with no freshwater, it is not advisable to drink sea water. Why not?
The salt in the body creates a hypertonic solution around cells, which causes water to diffuse out of the cells and make them shrink
20
The diagram shown depicts structures found in the cell. What cellular process takes place in the structure labeled number 4?
Protein synthesis
21
Which of the following can go directly through the plasma membrane?
Cholesterol