The renal medulla is the inner portion of the kidney
___________ Indicate whether the statement is true or false. Indicate whether the statement is true or false.
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In cells of human individuals with three or more X chromosomes, ____
a. one X chromosome remains active and the others are inactivated b. all of the X chromosomes remain active c. two X chromosomes remain active and the others are inactivated d. two X chromosomes remain active in females and one remains active in males; the rest are inactivated e. only one X chromosome is inactivated
Hair follicles and blood vessels are found in which layer of the skin?
a. epidermis b. dermis c. subcutaneous tissue d. stratum basale e. stratum corneum
The immune system component with a principal role at point B in the accompanying figure is:
a. memory cells. b. IgM antibodies. c. IgG antibodies. d. cytotoxic T cells. e. antibody IgA.
Which statement is NOT true about root adaptations in plants?
A. Some plants have very poorly developed roots or none at all. B. Parasitic plants have root adaptations called haustoria that draw nutrients from the host. C. Bacteria of the genus Rhizobium live in root nodules in legumes, producing available nitrogen that the plant uses. D. Some plants, including orchids, require the presence of fungal symbionts to survive. E. Fungal mycorrhizae depend on plants for the fungus's supply of water and minerals.