Teamup Q Section 2 Flashcards
2.2 Which of the following transporters would you predict to use a Na+ electrochemical gradient for transport in an animal cell?
H+ pump.
Sucrose-H+ symporter.
Na+/Ca2+ antiporter.
Glucose uniporter.
Na+/Ca2+ antiporter.
2.4 Microtubules have polarity with a plus end and a minus end. Where is the minus end typically found in an animal cell?
A. Attached to γ-tubulin.
B. Attached to a centriole.
C. Attached to the plasma membrane.
D. Attached to the nucleus.
A. Attached to γ-tubulin.
2.4What is the effect of nucleotide hydrolysis on a microtubule?
A. Increases the rate of tubulin dimer addition to the microtubule.
B. Stabilizes the tubulin dimers in the microtubule.
C. Decreases strength of binding between tubulin dimers in the microtubule.
D. Promotes nucleation of the microtubule minus end.
C. Decreases strength of binding between tubulin dimers in the microtubule.
2.4 You have three drugs that interact with components of the cytoskeleton:
- Phalloidin binds actin filaments and stabilizes them.
- Latrunculin binds actin monomers and prevents polymerization.
- Taxol binds and stabilizes microtubules.
Which drug(s) could you use to inhibit the motility of a neutrophil that moves by crawling?
A. Phalloidin.
B. Latrunculin.
C. Taxol.
D. Both A and B.
D. Both A and B.
2.4 For the cytoskeleton, which of the following statements isnotcorrect?
A. There are three types of protein filaments in the animal cytoskeleton.
B. Cytoskeletal filaments are held together by covalent bonds between protein monomers.
C. The location of organelles in eukaryotic cells is controlled by the cytoskeleton.
D. The surrounding environment can cause the cytoskeleton in a cell to change.
B. Cytoskeletal filaments are held together by covalent bonds between protein monomers.
2.5 Which of the following cell junctions does not connect neighboring cells in epithelial tissue?
A. Hemidesmosomes.
B. Desmosomes.
C. Tight Junctions.
D. Adherens junctions.
Hemidesmosomes
2.5 In comparing gap junctions and plasmodesmata, which of the following statements is correct?
Both gap junctions and plasmodesmata:
A. have a continuous plasma membrane across the channel.
B. allow passage of small soluble molecules (< 1000 daltons).
C. are gated.
D. both B and C.
D. both B and C.
2.5 Which of the following most likely describes a protein that will become a proteoglycan?
A protein that contains a:
A. ECM signal sequence
B. N-terminal ER signal sequence.
C. Collagen binding domain.
D. Transmembrane domain.
B. N-terminal ER signal sequence. (co translational translocation at er –> ends up in er lumen (er - vesicles - golgi -vesicles - PM) and so the secrete proteins are released to extracellular space
bc most gags are synthesized inside the cell and released by exocytosis and proteoglycans have gags
2.5 Which of the following statements is correct for the basal lamina?
A. It separates epithelial cells from each other.
B. It is connective tissue underlying an epithelium.
C. It is attached to the apical surface of an epithelium.
D. It is a layer of extracellular matrix underlying an epithelium.
D. It is a layer of extracellular matrix underlying an epithelium
