Which of the functions of a plasma membrane are accomplished by proteins in the membrane?
regulating the flow of materials and allowing interactions with other cells
Which statement best describes the relationship between RNA and DNA?
RNA is a copy of DNA that is used to make proteins.
In which of these cell types would you expect to find a membrane-enclosed nucleus?
Which of the components of the cytoskeleton is much more important to animal cells than to plant cells?
Which cellular structure has the most in common with the nuclear envelope?
Which of the following biological molecules accomplishes work within the cell?
Which of the following is a function of the smooth endoplasmic reticulum?
What is similar about exporting proteins from a cell and digesting food particles within a cell?
Both processes involve the formation of vesicles
The process of creating and exporting a protein requires many organelles. Which of the following lists these organelles in order?
nucleus, rough ER, vesicle, golgi apparatus, vesicle
How are the jobs of the mitochondrion and the chloroplast related?
Mitochondria and chloroplasts both convert energy from some other form into ATP.
Think of all the structures that prokaryotic cells possess and those that they lack. What is the common feature of most of the missing structures?
Most of the missing structures are enclosed by a membrane.
Thermus aquaticus is a species of archaebacteria that grows in steaming hot springs. What would you expect to find in the plasma membrane of this species?
phospholipids with saturated fatty acid tails
What is one feature all receptor proteins must share?
All receptor proteins must span the cell membrane, having a portion outside the cell and a portion inside.
When can a cell transport a molecule across the cell membrane without expending energy?
When the molecule is more concentrated outside the cell.
Cell A has no membrane proteins at all. Cell B has aquaporin membrane proteins. Both cells are placed in a hypertonic solution. What will happen?
Cell B shrivels faster than cell A.
A cell has no membrane proteins at all. Which substance will diffuse across the membrane fastest?
If the cytoplasmic fluid of cells in a houseplant were to become very salty, what would happen inside those cells?
The vacuoles would shrivel, but the cells would maintain turgor pressure.
Which of the following would be likely to raise the concentration of calcium ions in a cell?
blocking ATP binding sites
As a cell gets larger, which measurement of the cell increases the fastest?
What do gap junctions, tight junctions, and desmosomes have in common with each other, but not with plasmodesmata?
They are made of protein.
Which of these allows hormones to pass from one plant cell to another?
Which type of connection would you expect to find between cells of the blood vessels?
Imagine a candy bar sitting on a table in front of you. Which specific types of energy are present in the candy bar?
heat, chemical, and positional energy
A man wants to build a windmill to generate electricity. What type of energy is the man trying to take from the wind?
Which of the following represents an increase in entropy?
smashing a drinking glass
What is the definition of an endergonic reaction?
a reaction where the products have more energy than the reactants
When grilling using charcoal, people often wet the charcoal with lighter fluid first. The lighter fluid catches fire first and eventually sets the coals burning. Why does the lighter fluid light faster than the charcoal?
Setting lighter fluid on fire takes less activation energy than setting charcoal on fire.
Which of these is a correct description of a coupled reaction?
In a coupled reaction, an exergonic reaction provides energy to run an endergonic reaction.
Which of the following reactions could be coupled with the synthesis of ATP from ADP and phosphate?
the breakdown of sugar into water and carbon dioxide
How do competitive inhibitors stop a chemical reaction?
Competitive inhibitors bind in the active site of an enzyme.
Why does feedback inhibition occur at the beginning of a metabolic pathway instead of in the middle?
because all of the initial substrates would still be used up if the pathway were stopped in the middle
The law of conservation of energy states that although the form of energy used remains the same, the total amount of energy changes. True or False?
Energy is defined as the capacity to do work. True or False?
The burning of sugar is an example of an endergonic reaction, and photosynthesis is an example of an exergonic reaction. True or False?