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

Biology & Microbiology

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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

Biology & Microbiology

In angiosperms, but not conifers, pollen grains can form pollen tubes

Indicate whether the statement is true or false

Biology & Microbiology

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.

Biology & Microbiology

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

Biology & Microbiology