The plant cell wall network is comprised of all of the following except
A) hyaluronate.
B) cellulose.
C) extensin.
D) hemicellulose.
E) pectin.
A) hyaluronate.
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All ________ have two very different types of nuclei within their cells, small micronuclei and larger macronuclei.
A. sporozoans B. protists C. oomycetes D. ciliates E. dinoflagellates
Responsible ranching is important to the health of riparian zones because ________
a. cattle movement inadvertently aids plant reproduction in riparian zones b. a few head of cattle can destroy a riparian zone if allowed to graze there without control c. around 70% of endemic species live in riparian zones d. cattle rely on the riparian zones for food and water
Nekton are restricted to particular ocean areas by:
What will be an ideal response?
Which one of the following best explains how water moves freely across a plasma membrane?
A) Water moves directly through the phospholipid bilayer because of the charges on phospholipids. B) Water is brought into the cell by facilitated diffusion but released by exocytosis. C) It is actively transported across the membrane. D) Water moves through protein-lined channels in the plasma membrane. E) The passage of water across a plasma membrane requires facilitated transport.