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The smooth ER is the primary site for the synthesis of phospholipids and cholesterol needed to make ____.


A) DNA
B) ATP
C) ribosomes
D) hormones
E) cell membranes

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DNA is associated with RNA and certain proteins, forming a complex called:


A) chromosomes.
B) chromatin.
C) nucleoli.
D) nucleus.
E) genes.

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As a result of testing an experimental drip on a vertebrate cell, you notice that the cell cortex becomes more fluid, and although the cell remains strong, it loses its ability to move. Based on this evidence, you correctly conclude that the drug most directly affected:


A) myosin.
B) β -tubulin.
C) α -tubulin.
D) actin filaments.
E) intermediate filaments.

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Which process is a function of peroxisomes?


A) cell death
B) detoxification
C) water storage
D) protein synthesis
E) DNA replication

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Figure 4-4 Figure 4-4   In the accompanying figure, the formation of carbohydrates from carbon dioxide and water occurs in the portion of labeled: A)  A B)  B C)  C D)  D E)  E In the accompanying figure, the formation of carbohydrates from carbon dioxide and water occurs in the portion of labeled:


A) A
B) B
C) C
D) D
E) E

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Identify two structural components of the cytoskeleton, and briefly describe their function(s).

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Microtubules of the cytoskelet...

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Upon observing a cell of a grass blade, you notice a prominent sac that occupies a large portion of the cell. Which organelle is this?


A) nucleus
B) vacuole
C) lysosome
D) chloroplasts
E) mitochondria

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Why is it advantageous for cells to be small?


A) A small cell size prevents a cell from weighing too much.
B) A small cell is better able to conserve energy than a larger cell.
C) A small cell size occupies less space in nature where space is limited.
D) A small cell has a small surface area relative to volume, thereby facilitating ion balance.
E) A small cell has a small volume relative to surface area, thereby increasing efficient transport.

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Which of the following is a key component of the cytoskeleton?


A) centrosome
B) microtubules
C) DNA
D) ribosomes
E) endoplasmic reticulum

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A single cell in a smoker's lung has become cancerous. It doubles its DNA and divides much faster than a normal lung cell. The most likely change that would have caused this condition took place in the:


A) nucleus.
B) nucleolus.
C) lysosome.
D) microtubule.
E) mitochondria.

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Which of the following pairs is correctly matched?


A) middle lamella − cellulose
B) integrins − receptors
C) primary cell wall − pectin
D) fibronectins − wood
E) secondary cell wall − glycoproteins

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