Which structure contains the photoreceptors in the human eye?
1.choroid
2.cornea
3.pupil
4.retina
4
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A free radical takes what particle from a stable molecule?
a. a proton b. an electron c. a neutron d. an atom e. a hydrogen ion
When the concentration of glucose in the blood rises following the digestion of a meal, what is the hormonal response?
A) Increased amounts of both glucagon and insulin are released. B) An increased amount of glucagon is released. C) An increased amount of insulin is released. D) Glucagon and insulin levels in the blood stay the same.
Choose the letter of the best match from the following:A. abscisic acidB. trichomesC. aquaporinD. endodermisE. stomaRegulates movement of mineral ions into root xylem.
Fill in the blank(s) with the appropriate word(s).
You are given four test tubes, each containing an unknown protist, and your task is to read the following description and match these four protists to the correct test tube.When light, especially red and blue light, is shone on the tubes, oxygen bubbles accumulate on the inside of test tubes 1 and 2. Chemical analysis of test tube 1 indicates the presence of a chemical that is toxic to fish and humans. Chemical analysis of test tube 2 indicates the presence of substantial amounts of silica. Microscopic analysis of organisms in test tubes 1, 3, and 4 reveals the presence of permanent, membrane-bounded sacs just under the plasma membrane. Microscopic analysis of organisms in test tube 3 reveals the presence of an apicoplast in each.
Microscopic analysis of the contents in test tube 4 reveals the presence of one large nucleus and one small nucleus in each organism. Test tube 1 contains ________ A) Paramecium B) Pfiesteria(dinoflagellate) C) Entamoeba D) Plasmodium