BI110 Lecture Notes - Lecture 17: Cytoskeleton, Fluid Compartments, Pinocytosis
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1) During the translation phase of protein synthesis, where would you find an anticodon
a)on the DNA strand |
B) on the mRNA strand |
C) on the large subunit of the ribosome |
D) on the small subunit of the ribosome |
E) on the strand of tRNA |
2) The nucleus of a cell contains one or more of these structures that are the site of production of ribosomes.
a) histones |
b)nucleolus |
c) chromatin |
d) nucleosome |
e) centrosome |
3) Which of the following organelles oxidizes toxic substances such as alcohol, and breaks down other potentially harmful by-products of metabolism
a) lysosomes |
b)peroxisomes |
C) mitochondria |
d) proteasomes |
e) ribosomes |
4) Which represents a passive process?
a) movement of sodium ion from inside a cell to outside a cell |
B)movement of water from an area of high water concentration to an area of low water concentration |
C)movement of solute particles against their concentration gradient |
D)the use of ATPase to move ions 5) A low-density lipoprotein is transported into the cell through a clathrin coated receptor and is degraded. This type of endocytosis is
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1- Which of the following examples involves active transport?
a) | Release of calcium stored at high concentrations in the endoplasmic reticulum into the cytoplasm. | |
b) | Sodium ions (Na+) flowing into a cell through a channel protein. | |
c) | Transporting calcium out of a cell into an solution rich in calcium. | |
d) | Uptake of a hydrophobic dye newly placed in a solution by cells living in the solution. |
2- Chemical analysis of a cellular membrane would normally reveal the presence of
A) sugars | ||
B) proteins | ||
C) lipids | ||
D) nucleic acids | ||
E) A, B and C |
3- If you place a culture of animal cells into a container filled with molecules of red dye that have a strong negative charge, and the dye ends up inside the cell, what is the most likely explanation for the uptake?
a) | osmosis | |
b) | active transport | |
c) | pinocytosis | |
d) | phagocytosis | |
e) | exocytosis |
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Question 5
At a constant temperature, if you increase the number of unsaturated fatty acid chains in the phospholipid, the membrane will become......
less fluid |
more fluid |
fluidity will be unchanged |
Question 6
Bacteria in a hot spring at 80 degrees celsius would be expected to have ______________ in their cell membrane
high proportions of saturated phospholipids |
high proportions of unsaturated phospholipids |
an equal ratio of saturated to unsaturated phospholipid |
Question 7
Membrane proteins have an important role in membrane fluidity
True |
False |
Question 8
The HIV virus can't attach to cells that have a mutation in the CCR5 gene and so such individuals are resistant to HIV. What population of people have a higher incidence of the mutant CCR5 gene and why?
europeans because their ancestors survived the bubonic plague |
North Americans because their ancestors survived small pox |
europeans because they have a longer evolutionary past with HIV |
Africans because they have a longer evolutionary past with HIV |
Question 9
Nematode trapping fungi have ______________ molecules called ______________ that recognize specific carbohydrates on the surface of the nematode worms. This is how a fungus can recognize that its prey, the nematode worm, has wriggled into the loop. Write two words on lowercase separated by a space with no other syntax
Question 10
Diffusion requires energy
True |
False |
Question 11
The net direction of molecule movement when molecules diffuse is
down their concentration gradient |
random directions |
Question 12
In osmosis, water molecules from a solution of higher solute concentration cross a semi-permeable membrane into a solution of lower solute concentration?
True |
False |
Question 13
Which best defines osmosis?
In osmosis, water from a solution of lower solute concentration move across a semi-permeable membrane into a solution of higher solute concentration? |
In osmosis, water from a solution of higher solute concentration move across a semi-permeable membrane into a solution of lower solute concentration? |
Question 14
Animal cells placed into a hypotonic solution would most likely?
lyse (burst) |
shrink |
remain unchanged in size |
Question 15
Glucose and amino acids move into cells via carrier proteins, the same protein can move glucose or amino acids
True |
False |
Question 16
ATP powered pumps move substances into and out of cells by diffusion?
True |
False |
Question 17
For every 3 Na ions moved out, 2 K ions are moved into a cell by one cycle of the sodium-potassium pump.
True |
False |
Question 18
Bulk transport of fluid and any of the substances within that fluid is called
pinocytosis |
phagocytosis |
receptor-mediated endocytosis |
exocytosis |