Generalist insect herbivores feed on more than one kind of plant. Typically, how many different families of plants do they feed on?
a. 2
b. 3
c. 5
d. More than 5
Answer: b. 3
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The ____ functions as the body’s thermostat
a. glands b. muscles c. brain stem d. sensory receptors e. hypothalamus
The sliding filament model for muscle contraction can be studied using an isolated skeletal muscle that is fixed at each end, while a machine records the tension that is generated when the muscle is stimulated to contract. In one particular muscle tested, the length of the thick filaments was 1.6 ?m, and the length of the thin filaments that project in from each Z line toward the center of the sarcomere was 1.0 ?m. A summary of the results comparing sarcomere length to the degree of tension produced during contraction is shown below. What most likely explains the difference between segment II and segment III of the graph?
A. There is an increasing overlap of the free ends of the thin filaments in segment III but not in segment II. B. The distance between the Z lines is constant in segment II but rapidly increasing in segment III. C. Fewer myosin cross-bridges are forming in segment II than in segment III. D. The muscle cells used up all the ATP by the end of segment II. E. The length of the thin filaments is decreasing in segment III but not in segment II. F. The length of the thick filaments is decreasing in segment III but not in segment II.
Because of the low penetration power of electrons, samples for transmission electron microscopy must be extremely thin. A(n) ________ is able to cut sections as thin as 20 nm
Fill in the blank with correct word.
Susan was examining a cell under the microscope and noticed the formation of a cell plate in the midline of the cell and the formation of nuclei at opposite poles of the cell. The cell under examination was most likely a(n) _________.
Fill in the blank(s) with the appropriate word(s).