Which of the following statements about prokaryotic cells is generally false?
A) They have a semirigid cell wall.
B) They are motile by means of flagella.
C) They possess 80S ribosomes.
D) They reproduce by binary fission.
E) They lack membrane-bound nuclei.
Ans: C) They possess 80S ribosomes.
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Match the cell adhesion or junction on the left with the appropriate choice on the right.
A) protein subunits associated with gap junctions B) a type of adhesive junction connecting an epithelial cell to the basal lamina C) collection of fibrous intracellular attachment proteins D) create a permeability barrier E) button-like points of strong adhesion between two cells F) hollow cylinders associated with gap junctions G) type of adherens junction connecting cells with the extracellular matrix H) intermediate filaments associated with plaques I) collection of adherens junctions particularly associated with epithelial cells J) type of adhesive junction containing actin microfilaments K) specialized modifications of the cell membrane in which two cells come together in multicellular organisms L) point of cytoplasmic contact between two cells M) anchors cytoskeleton of one cell with that of a neighboring cell 1) adherens junction 2) desmosome 3) cell junctions 4) connexons 5) plaque 6) tonofilaments 7) hemidesmosomes 8) adhesion belt 9) adhesive junction 10) tight junctions 11) connexin 12) gap junction 13) focal contact
Protease inhibitors:a
inhibit the action of reverse transcriptase. b. are glycoproteins found in saliva. c. result in viral copies that cannot infect new cells. d. can cure AIDS patients. e. destroy helper T cells.
An enzyme's name is NOT likely to include
A. the type of reaction the enzyme facilitates. B. the location in the body where the enzyme is commonly found. C. the substrate the enzyme works on. D. -ase.
how plants defy gravity
What will be an ideal response?