A cell or cell component that changes in response to specific stimuli is a(n) ________
a. feedback mechanism
b. effector
c. receptor
d. integrator
c
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Which structure in the eye allows light to enter?
a. Sclera b. Pupil c. Cornea d. Iris e. Retina
Scientists now believe that comets falling to early Earth played a role in the evolution of life. What role did these comets play?
A) They brought CO2 and H2O. B) They brought ammonia ions (NH4). C) They generated a lot of energy when they hit Earth. D) All of the above are true.
When the atoms involved in a covalent bond have the same electronegativity, what type of bond results?
A) an ionic bond B) a hydrogen bond C) a nonpolar covalent bond D) a polar covalent bond
Which statement is NOT true about vascular tissue in plants?
A. Xylem cells are hollow and nonliving, and they form a continuous pipeline that transports water and minerals. B. In stems, the vascular tissue is found in the vascular bundles. C. Phloem cells are hollow and nonliving, and they form a continuous pipeline that transports sugars. D. In roots, the vascular tissue is found in the central vascular cylinder. E. In leaves, the vascular tissue is found in the leaf veins.