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Exam 3: The Cell

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Question 21

Multiple Choice

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A mutation has changed the sequence in a codon from UGG to UGA.Using the codon chart provided in this figure,determine the change in the amino acid sequence.

A) from tryptophan to stop
B) from glycine to glutamine
C) from start to stop
D) from threonine to threonine

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Question 22

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A cell is placed into a 3% dextrose solution.At that concentration,the solution is isotonic to the cell.If the concentration of dextrose in the solution is increased to 5%,the cell is now in a(n) :

A) less concentrated solution.
B) isotonic solution.
C) hypotonic solution.
D) hypertonic solution.

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Question 23

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Mr.Weddington was admitted to the hospital with chronic heart failure.His feet and legs were swollen with fluid.He should be given a hypotonic drip to draw fluid out of his cells.

Summarize the cell's activities during the G₁,S,and G₂ phases of the cell cycle.

Explain semiconservative replication as it relates to DNA synthesis,or replication.

Tightly coiled DNA molecules present during cell division are known as:

Summarize the two steps of protein synthesis.

Explain why humans should avoid drinking salt water.

Place the following steps of endomembrane system function in the correct order. 1.Golgi apparatus receives transport vesicles from the RER. 2) Ribosomes on the RER synthesize proteins. 3) Proteins are packaged into transport vesicles. 4) Modified proteins may be secreted from the cell by exocytosis. 5) Proteins are modified by the Golgi apparatus.

The unit of DNA that specifies a certain amino acid is called a__________ ,the same unit of mRNA is called a(n) __________which,during protein synthesis,is matched by the of tRNA.

The fluid mosaic model defines the plasma membrane as a structure composed of multiple components,including the phospholipid bilayer,proteins,carbohydrates,and other lipids that exist in a dynamic arrangement.

Within the nucleus,where does ribosome assembly occur?

What is NOT a function of the plasma membrane?

A substance moves by facilitated diffusion into a cell.What is required for its transport?

Molecular machines that perform specific functions for the cell are:

The completion of cytokinesis accompanies:

Which of the following is NOT a function of the plasma membrane proteins?

Elongation of the polypeptide continues as long as a new tRNA molecule situates in the:

Microtubules are composed of protein subunits known as:

The total solute concentration of a red blood cell is about 2%.Sucrose cannot pass through a red blood cell's plasma membrane,but water and urea can.Which of the following solutions will cause a red blood cell to shrink?