What is the main form of photosynthetic life in the limnetic zone?
A) phytoplankton
B) floating species
C) emerging species
D) submergent species
A
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Epigenetic effects on gene expression may occur through covalent modifications of ________ and ________
Fill in the blank with correct word.
One difference between cardiac muscle fibers and skeletal muscle fibers is that cardiac muscle fibers:a
have several nuclei, while skeletal muscle fibers do not. b. are not striated, while skeletal muscle fibers are. c. are under voluntary control, while skeletal muscle fibers are not. d. branch and form complex networks, while skeletal muscle fibers do not. e. are cylindrical-shaped, while skeletal muscle fibers are spindle-shaped.
Which statement about temperate broadleaf forests is true?
A) Temperate broadleaf forests have a narrow range of temperatures over the course of a year. B) Oak, hickory, birch, beech, and maple are common trees in temperate broadleaf forests. C) Temperate broadleaf forests have very poor soil. D) Temperate broadleaf forests are less open than tropical rain forests.
Which of the following statements about cellulose is false?
(a) Cellulose synthase enzyme complexes are integral membrane proteins. (b) An array of microtubules guides the cellulose synthase complex as it moves in the membrane. (c) The sugar monomers necessary for the synthesis of a cellulose polymer are transported across the plasma membrane. (d) Microtubules are directly attached to the outside surface of the plasma membraneto form tracks that help orient the cellulose polymers.