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Which of the following components of the plasma membrane forms ion channels?


A) peripheral membrane proteins
B) phospholipids
C) cholesterol
D) transmembrane proteins
E) transmembrane glycolipids

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Glycoproteins have a glycogen molecule covalently bound to a protein.

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are membrane- bound organelles containing enzymes that degrade cellular and extracellular debris.


A) Mitochondria
B) Peroxisomes
C) Vaults
D) Lysosomes
E) Ribosomes

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The cytoskeleton suspends the organelles within the cytoplasm.

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What is the extensively branched polymer of hexose found in animals?


A) glycogen
B) starch
C) rRNA
D) lactose
E) glucose

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Where is the genetic code stored?


A) vaults
B) heart
C) nucleus
D) brain
E) cytoplasm

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Which of the following statements about the genetic code is TRUE?


A) A single gene contains only those nucleotides that code for a single protein.
B) The promoter sequence is found on the antisense strand of DNA.
C) A single codon may code for more than one amino acid.
D) Termination codons do not code for amino acids.
E) The tRNA anticodon is complementary to the mRNA codon, and therefore is identical to the gene's DNA triplet.

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The junctions created by intermediate filaments which penetrate the membranes between two cells at the site of protein plaques, thereby forming strong linkage between the two cells, are also known as


A) desmosomes.
B) basal lamina.
C) tight junctions.
D) hemidesmosomes.
E) gap junctions.

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What enzyme catalyzes the reaction whereby nucleotides are added to the polynucleotide chain during replication?


A) chromatin
B) DNA polymerase
C) histone
D) RNA polymerase
E) helicase

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All of the organelles present within a cell are not bound by membranes. Describe the non- membrane- bound organelles that are found in cells.

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Ribosomes are dense granules composed of...

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Alpha- helixes and fi- pleated sheets are examples of structures of a protein.


A) primary
B) secondary
C) tertiary
D) quaternary
E) quinary

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If guanine makes up 29% of the nucleotides in a sample of DNA, what percentage of the sample would be adenine?


A) 11
B) 35
C) 42
D) 21
E) 29

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Intercellular communication can occur through the binding of a chemical released from one cell to a specific on another cell.


A) organelle
B) phagosome
C) receptor
D) clathrin- coated vesicle
E) nucleus

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Describe the process of gene transcription, including how that process is regulated.

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The section of DNA that contains a gene ...

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In order for tissues to maintain their structure and function, there must be some way for cells to adhere to their neighbors. Describe the adhesion proteins that function in coupling one cell to the next.

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Tight junctions are composed of integral...

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The leader sequence of any protein that has just been translated functions to


A) determine the destination of the protein.
B) end translation of a protein.
C) initiate degradation of an incomplete protein.
D) keep the protein in the cytosol.
E) stimulate translation of a protein.

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Which of the following is NOT a possible destination for proteins that are completely synthesized on ribosomes free in the cytosol?


A) mitochondrion
B) secreted from the cell
C) peroxisome
D) nucleus
E) remains in cytosol

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Which microtubular proteins are responsible for the distribution of chromosomes during cell division?


A) keratin
B) tubulin
C) myosin
D) spindle fibers
E) actin

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Based upon a sequence of 15 nucleotides in a strand of DNA, what is the maximum amount of amino acids produced?


A) 3
B) 5
C) 50
D) 2
E) 7

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What is the correct order for the following list of steps for initiating translation? 1. Binding of initiator tRNA to mRNA 2) Binding of large ribosomal subunit to mRNA 3) Binding of small ribosomal subunit to mRNA 4) Binding of a 2nd tRNA with its amino acid to the A site 5) Formation of covalent bond between methionine and second amino acid


A) 1, 3, 2, 4, 5
B) 1, 2, 3, 4, 5
C) 3, 1, 2, 4, 5
D) 3, 2, 1, 4, 5
E) 2, 3, 1, 4, 5

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