Insertion sequences are ________.
A. are discrete genetic elements bounded at both ends with inverted repeats
B. capable of transposition
C. normally relatively short (700 to 1,650 bp)
D. All of the choices are correct.
Answer: D
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The patient is non-infectious in the third stage of syphilis
Indicate whether this statement is TRUE or FALSE.
An animal with bilateral symmetry
a. has left and right sides. b. usually displays cephalization. c. produces mirror images regardless of the number of “cuts” through the central axis. d. has left and right sides and usually displays cephalization. e. has left and right sides, usually displays cephalization, and produces mirror images regardless of the number of “cuts” through the central axis.
Which of the following statements about the organs of balance and equilibrium is false?
A. The three semicircular canals of the vestibular apparatus function in dynamic equilibrium. B. At the base of each semicircular canal is a bulging region called the ampulla. C. The brain receives and integrates signals from the semicircular canals on both sides of the head. D. dynamic equilibrium allows you to keep your eyes locked on an object even when you swivel your head or nod. E. Organs in the saccule and utricle act in the sense of dynamic equilibrium.
The sperm head encloses a compact nucleus and is capped by a vesicle called what?
A. vas deferens B. acrosome C. epididymis D. Sertoli cell E. flagellum