How do mosses help prevent soil erosion?
a. Mosses absorb the majority of running water.
b. Mosses have no role in soil formation or erosion.
c. Mosses provide an additional habitat to soil organisms.
d. Mosses have roots that create a lattice beneath the soil.
e. Mosses are packed in dense colonies, holding soil together
e
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How many heme groups does each hemoglobin molecule contain?
a. one b. two c. four d. eight
Which of the following dicotyledon root tissues/cells are in order from the outside of the root to the inside?
a. epidermis, cortex, endodermis, pericycle, vascular tissue b. epidermis, cortex, pericycle, endodermis, vascular tissue c. epidermis, cortex, pericycle, vascular tissue, endodermis d. epidermis, cortex, endodermis, vascular tissue, pericycle e. epidermis, pericycle, cortex, endodermis, vascular tissue
The drug taxol, or paclitaxel, is used to treat patients with a variety of cancers, including breast, lung and ovarian cancers. The drug works by stabilizing microtubules, and preventing their disassembly. The goal of the drug is to prevent dividing cells from being able to complete mitosis. As a result, cancerous cells can no longer divide. In a cell treated with taxol, at what stage of mitosis will the cells arrest?
A. telophase B. prior to metaphase C. anaphase D. cytokinesis
Which of the following is not a component of the physical habitat in which organisms live?
A. water B. wind C. bacteria D. rocks