Which of the following statements about essential nutrients are true? Essential nutrients _____.
I) are necessary for plant growth and reproduction
II) are required for a specific structure or metabolic function
III) cannot be synthesized by a plant
IV) are produced by symbiotic bacteria
A) I and IV
B) I, II, III, and IV
C) I, II, and III
D) II, III, and IV
Ans: C) I, II, and III
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Which embryonic trait is not found among the chordates?
a. Tail that extends beyond the anus b. Notochord c. Dorsal hollow nerve cord d. Mouth develops 1st e. Gill slits
In spongy bone tissue, the spaces are filled with:
a. air b. blood c. cartilage d. red bone marrow e. lymph
Independent assortment occurs between two pairs of homologous chromosomes that can be arranged
in four different ways at metaphase of meiosis. __________________ Indicate whether the statement is true or false.
Epinephrine blocks the contraction of muscles in the airways. Which of the other activities of epinephrine is most likely to be regulated by the same type of pathway?
A. promotes the breakdown of glycogen in skeletal muscle cells B. stimulation of heart muscle cell contraction C. increased sweating D. inhibition of saliva production in salivary glands E. contraction of smooth muscle cells in blood vessels