Describe the method by which nautiloids regulate their buoyancy
What will be an ideal response?
Tissue called the siphuncle extends into the chambers of the nautiloid shell. This tissue first removes salts from the seawater in the chambers by actively pumping these salts against a concentration gradient. Next, the dilute water remaining in the chambers moves into the siphuncle tissue by osmosis and it is replaced by metabolic gases that diffuse out of the siphuncle. The animal can control how much gas diffuses into or out of the siphuncle, thereby regulating buoyancy.
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Ocean acidification decreases the precipitation of calcium carbonate and thus will probably affect the cycling of Ca and other nutrients in the ocean
Indicate whether the statement is true or false.
The sequence of amino acids in a protein is its ______ structure.
A. primary B. secondary C. tertiary D. quaternary E. hepternary
A trait that varies continuously is likely to be affected by ________
a. one gene as well as the environment b. multiple genes but not the environment c. multiple genes as well as the environment d. one gene but not the environment
Which flatworms are free living and are found mostly in marine environments?
a. Turbellaria b. Trematoda c. Polychaeta d. Cestoda