The release of chemicals from injured cells triggers histamine release from
A) macrophages.
B) B cells.
C) neutrophils.
D) phagocytes.
E) mast cells.
E
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What structure may have acted as a boundary for a cell-like environment before protocells formed?
a. acidic water from volcanic springs b. chambers in rocks c. metal ions from rocks d. clay e. lipid membrane
Why is it important to maintain a collection of wild relatives of crop plants?
a. Humans have a natural urge to collect things. b. It allows future generations to see plants that are gone. c. Seeds are not stable. d. Crop plants do not produce their own seeds. e. It provides insurance in the form of genetic diversity.
Using the compound light microscope in the lab room, you observe a wet mount slide preparation. You observe layers of cells that have a definite, rigid, rectangular shape; there appears to be a nucleus in all of the cells and there are many oval-shaped green structures that seem to be moving around inside of the cells in an orderly fashion. What general cell type are you most likely observing?
a. prokaryotic and plant c. eukaryotic and plant b. prokaryotic and animal d. eukaryotic and animal
Your intestine is lined with individual cells. No fluids leak between these cells from the gut into your body. Why?
What will be an ideal response?