Chapter 3 Flashcards
Which of the following is true regarding the generation of a membrane potential?
Both potassium and sodium ions can “leak” through the cell membrane due to diffusion.
Which statement best describes transcytosis?
transporting an endoscope from one side of a cell to the other and releasing the contents by exocytosis.
In certain kinds of muscle cells, calcium ions are stored in
the smooth ER
The RNA, responsible for bringing the amino acids to the “factory” site for protein formation is
tRNA
A red blood cell placed in pure water would
swell and burst
Which of the following describes the plasma membrane?
the phospholipid bilayer surrounding the cell
Which of these is NOT a function of the plasma membrane?
it prevents potassium ions from leaking out and sodium ions from crossing into the cell.
Which structures are fingerlike projections that greatly increase the absorbing surface of cells?
microvilli
Which of the following statements is correct regarding diffusion?
The greater the concentration of gradient, the faster the rate of diffusion
Cell junctions that promote the coordinated activity of cells by physically binding them together into a cell community include all of the following except
peroxisomes
If cells are placed in a hypertonic solution containing a solute to which the membrane is impermeable, what could happen?
the cells will lose water and shrink
Which of the following is NOT a sub cellular structure?
Intercellular material
Once solid material is phagocytize and taken into a vacuole, which of the following statements best describes what happens?
A lysosome combines with the vacuole and digests the enclosed solid material.
Riboswitches are folded RNAs that act as switches to turn protein synthesis on or off in response to
changes in the environment
Which of the following is a function of a plasma membrane protein?
molecular transport through the membrane
Which of the following statements is correct regarding RNA?
Messenger RNA, transfer RNA, and ribosomal RNA play a role in protein synthesis
Which of the following would NOT be a constituent of a plasma membrane?
messenger RNA
Mitosis
produces nucleus replication