Some members of the spirochetes move by means of
A. gliding.
B. hami.
C. peritrichous flagella.
D. axial filaments.
E. nothing, they are non-motile.
Answer: D
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Which of the following is NOT true of plant
hormones?
a. they are active in an adult plant body b. they are signaling molecules c. they produce effects only at high concentrations d. they are produced only in certain regions of the plant e. all of these are NOT true of plant hormones
The hormones secreted from the adrenal cortex, like cortisol, which raise the blood glucose level are collectively called _______
A. Mineralocorticoids
B. Gonadocorticoids
C. Corticosteroids
D. Glucocorticoids
According to the sliding filament model of muscle contraction, a sarcomere contracts when its
A) thick filaments slide across its Z lines. B) thin filaments slide across its Z lines. C) thin filaments slide along its thick filaments. D) thick filaments move closer together.
Which statement about deserts and the organisms that live there is true?
A) Air temperatures in cold deserts, such as those west of the Rocky Mountains, may never fall below 30°C. B) Growth and reproduction occur year-round in deserts. C) Desert plants typically produce very few seeds. D) Many desert animals are nocturnal.