Most xylem vessels in angiosperms consist of stacked vessel elements, water flows vertically through ____ and laterally through ____
a. phloem; xylem
b. vessel elements; tracheids
c. tracheids; vessel elements
d. perforation plates; pits
e. pits; plasmodesmata
d
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In order for homeostasis to be maintained a(n) ________ must detect a specific stimulus
a. affector b. sensory receptor c. gland d. sensory affector e. effector
In angiosperms, but not conifers, pollen grains can form pollen tubes
Indicate whether the statement is true or false
Phylogenetic methods developed by evolutionary biologists to find the best tree possible for the taxa under study are called:
a. parsimony methods. b. distance methods. c. maximum likelihood methods. d. Bayesian inference methods. e. All of the above.
Cytotoxic T-cells produce _______.
A. perforin, which makes holes in cell membrane of infected cells B. antibodies, which make holes in cell membrane of infected cells C. interferon which attacks viral-infected cell D. class II MHC which present antigens