Which of the following are phagocytic cells descended from monocytes?
A. alveolar macrophages
B. dendritic cells
C. microglial cells
D. alveolar macrophages and dendritic cells
E. alveolar macrophages and microglial cells
Answer: E
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Use the following figure and information to answer the question(s) below
Fishes that have swim bladders can regulate their density and, thus, their buoyancy. There are two types of swim bladder: physostomous and physoclistous. The ancestral version is the physostomous version, in which the swim bladder is connected to the esophagus via a short tube (see the figure above). The fish fills this version by swimming to the surface, taking gulps of air, and directing them into the swim bladder. Air is removed from this version by "belching." The physoclistous version is more derived, and has lost its connection to the esophagus. Instead, gas enters and leaves the swim bladder via special circulatory mechanisms within the wall of the swim bladder. When a shark stops swimming, it _____. 1. sinks 2. quickly dies 3. oxygenates its blood less effectively A) 1 only B) 2 only C) 3 only D) 1 and 3 E) 1, 2, and 3
Which statement is true?
a. The anterior pituitary gland is essentially nervous tissue. b. The anterior pituitary gland secretes only two hormones. c. Only the posterior part of the pituitary gland could be called the "master gland." d. The posterior pituitary gland only stores hormones produced by the hypothalamus. e. The anterior pituitary gland is conencted to the hpothalamus via the infindibulum.
The ________ is a factor-independent termination site found in the leader region of certain operons, which, under the influence of ribosome behavior, controls the continued transcription of that operon.
A. modulator B. terminator C. operator D. attenuator
The type of fish represented by the most living species on earth today are the
A. bony fishes. B. coelacanths. C. sharks. D. rays and skates.