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9 Cards in this Set
- Front
- Back
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A physiologist observes that the concentration of sodium inside of a cell is decidedly lower than that outside the cell. Sodium diffuses easily across the plasma membrane of such cells when they are dead, but not when they are alive. What cellular function that is lacking in dead cells expalins the difference?
a. osmosis b. diffusion c. active transport (solute pumping) d. dialysis |
C. active transport
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Which is not true of centrioles?
a. they start to duplicate in G1 b. they lie in the centrosome c. they are made of microtubules d. they are membrane-walled barrels lying parallel to each other |
D
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The nuclear substance composed of histone proteins and DNA in a substance is
a. chromatin b. nucleolus c nuclar sap d. nuclear pores |
a. chromatin
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The information sequence that determines the nature of a protein is
a. nucleotide b. gene c. triplet d. codon |
B
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Final preparations for cell division are made druing the life cycle subphase called
a. G1 b. G2 c. M d. S |
B. G2
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The RNA synthesized on one of the DNA strands is
a. mRNA b. tRNA c. rRNA d. all of these |
D
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The RNA species that carries the coded message, specifying the amino acid sequence in protein to be made, from the nucleus to cytoplasm is
a. mRNA b. tRNA c. rRNA d. all of these |
A
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A nerve cell and a lymphocyte are presumed to differ in their
a. specialized structure b. suppressed genes and embryonic histroy c genetic information d. a&b e. a&c |
D
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A pancreas cell makes proteins (enzymes) which it releases to small intestine. Which of the following best describes the path of these proteins from synthesis to exocytosis at the pancreatic cell's plasma membrane (PM)?
a. golgi > rough ER > PM b. smooth ER > Golgi > lysosome > PM c. rough ER > Golgi > PM d. nucleus > Golgi > PM |
C
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