The source region in the pressure flow explanation of phloem transport is most often the ____
a. root
b. flower
c. stem
d. leaf
e. soil
ANSWER: d
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Which of the following correctly lists components of extracellular matrix found in plants?
A. collagen, laminin, and elastin B. collagen, lignin, laminin, and pectin C. lignin, pectin, and keratin D. cellulose, pectin, lignin
A human X-linked gene is
a. found only in males. b. more frequently expressed in females. c. found on the Y chromosome. d. transmitted from father to son. e. found on the X chromosome.
The exchange of genetic material during crossing over causes which of the following?
A) genetic variation B) stasis C) heterozygosity D) homozygosity
______________ degranulate in response to neuromodu-lators released at the site of tissue damage.
A. Mast cells B. Basophil C. Macrophages D. NK cells E. T cells