The cytoskeleton ____.
A. extends between the nucleus and the plasma membrane
B. is found within the nucleus
C. is associated with only certain cell structures
D. is found within organelles
E. is found in all animal cells but not in cells with cell walls
Answer: A
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Which type of leukocyte contains heparin, an anticoagulant?
a. neutrophils b. basophil c. monocytes d. eosinophils e. megakaryocytes
Which cellular response follows activation of a ligand-gated ion channel?
a. direct regulation of gene expression b. generation of an electrical signal
c. activation of a phosphorylation cascade d. activation of a second messenger pathway e. direct activation of a kinase
What mechanism used for mobilization of transposable elements can lead to deletions in genomes?
A) Transposase sometimes deletes genomic DNA while removing DNA transposons from the genome. B) Alignment of two transposable elements is required for mobilization and misalignment can result in deletions. C) RNA polymerase transcribes transposable elements; when it makes mistakes, DNA nucleotides are sometimes deleted. D) Piwi RNAs inhibit movement of transposons by deleting DNA that includes and surrounds the inverted repeats.
Sclereids are cells that:a
are found in wood and bark. b. conduct water and dissolved minerals. c. are usually found in nut shells and pits of stone fruits. d. conduct dissolved sugars. e. form cytoplasmic connections between cells.