BSC 1010 FINAL EXAM REVIEW QUESTIONS WITH VERIFIED ANSWERS (ALREADY GRADED A+)

BSC 1010 FINAL EXAM REVIEW QUESTIONS
WITH VERIFIED ANSWERS (ALREADY
GRADED A+)

Put the steps of the process of signal transduction in the order they occur:

1. A conformational change in the signal-receptor complex activates an enzyme.

2. Protein kinases are activated.

3. A signal molecule binds to a receptor.

4. Target proteins are phosphorylated.

5. Second messenger molecules are released. - correct answer-3,1,5,2,4



Integrins are integral membrane proteins. They are often attached to . - correct answer-
cytoskeletal proteins and proteins in the extracellular matrix



Phosphorylation cascade involving a series of protein kinases are useful for cellular signal transduction
because they . - correct answer-amplify the original signal many times



The receptors doe steroid hormones are located inside the cell instead of on the membrane surface lik
e most other signal receptors. This is NOT a problem for steroids because .-
correct answer-
steroid hormones are lipid soluble, so they can readily diffuse through the lipid bilayer on the cell me
mbrane.



Which stateerning how the molecular composition of a plant cell wall compare with the extracellular
matrix of animal cells? - correct answer-
Plant cell wall fibers consist primarily of carbohydrates ECM fibers are dominated by proteins.



The structure that anchors adjacent epithelial cells via their cytoskeleton is the -
correct answer-desmosome



Activated signal receptors on the plasma membrane can carry out which two activities? -
correct answer-Catalyze receptor phosphorylation; activate G proteins

, Different cell types can respond differently to the same signaling molecule because
X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 .-
X2




correct answer-each cell type converts the signal to a different metabolite.
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When a lipid- soluble hormone enters a cell and binds a receptor, what happens to the receptor? -
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correct answer-It enters the nucleus and activates genes.
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Signaling pathways always work in complete isolation from one another. - correct answer-False
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In eukaryotic cells, chromosomes are composed of
X2 X2 X2 X2 X2 X2 X2 . - correct answer-DNA and proteins
X2 X2 X2 X2 X2




Forms of the Ras protein found in tumors would cause which of the following? - correct answer-
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DNA replication to be hyperactive.
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The mitotic spindle is a micro tubular structure that is involved in
X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 X2 . - correct answer-
X2 X2 X2




separation of sister chromatids.
X2 X2 X2 X2




What is the structure of mitosis promoting factor (mpf)? - correct answer-
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A cyclin protein bound to a cyclin-dependent kinase.
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Which of the following would be used to differentiate between benign and malignant tumors? -
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correct answer-The ability to invade other tissues
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Most cancer cells have defects in either growth signaling pathways or cell cycle control processes. -
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correct answer-True
X2 X2




What is the spindle apparatus? - correct answer-
X2 X2 X2 X2 X2 X2 X2




The microtubule structure that separates chromosomes
X2 X2 X2 X2 X2




The process of cytokinesis occurs differently in plants and animals. - correct answer-True
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Proteins that are involved in the regulation of the cell cycle and that show fluctuations in concentratio n
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during the cell cycle are called
2 X2 . - correct answer-cyclins
X2 X2 X2 X2 X2 X2 X2 X2