Based on morphology and phytochrome gene sequencing data, it appears that the closest living relative
of the first flowering plants is ____.
a. Magnolia grandiflora
b. Illicium floridanum
c. Nelumbo nucifera
d. Archaefructus sinensis
e. Amborella trichopoda
E
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Which of the following is true of gap junctions?
A. They are holes in the cell wall through which the plasma membrane and endoplasmic reticulum of adjacent cells are connected. B. They are channels in the plasma membrane of plant cells made of transmembrane proteins that allow ions and small molecules to pass between adjacent cells. C. They are channels in the plasma membrane of animal cells made of transmembrane proteins that allow ions and small molecules to pass between adjacent cells. D. They provide points of structural support between adjacent plant cells. E. They provide points of structural support between adjacent animal cells.
Steroid hormones do not require a membrane receptor because they:
a. are small enough to pass directly through pores in the membrane b. are lipid-soluble and pass through the bilayer c. pass through special channels d. are water-soluble e. dissolve in the cholesterol of the membranes
Herbivores are unable to digest ________ and thus rely on the help of specialized bacteria and protozoa living in their digestive tracts
Fill in the blank(s) with correct word
Match each description to its correct term.
A. a mesh of cytoskeletal elements that attach the sarcomere to its surrounding components B. substance that binds to the thick-filament head causing it to release thin filament and return to its low-energy state C. supply the ATP necessary for muscle contraction D. component of thin filaments E. contractile units of muscle F. cross-bridge is formed between thick and thin filaments following the release of this substance from ATP bound to myosin G. threadlike protein structures consisting of contractile units arranged end to end; comprises the bulk of the muscle fiber H. consists of sarcomeres that are not aligned I. consist of myosin, a motor protein with a clublike head and a long tail J. this protein repeatedly binds, moves, and releases an adjacent thin filament causing a muscle to contract K.