Which one of the following structures is not found in all adult and larval tunicates?
A. Gill slits
B. Incurrent siphon
C. Notochord
D. Excurrent siphon
E. Pharynx
Answer: C
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Programmed cell death is called _______
A. destruction initiation B. apoptosis C. myogenesis D. morphogens
The three main energetic components of sunlight are
A. gamma rays, visible light, and infrared radiation. B. visible light, radio waves, and ultraviolet radiation. C. ultraviolet radiation, visible light, and x-rays. D. ultraviolet radiation, visible light, and infrared radiation. E. microwaves, visible light, and ultraviolet radiation.
The white matter differs from gray matter in
that
a. white matter is found in the brain, and gray matter is found in the spinal cord. b. white matter consists of bundles of myelinsheathed axons, and gray matter consists of cell bodies, dendrites, and neuroglial cell. c. white matter transmits sensory information, and gray matter transmits motor information. d. white matter is associated with the sympathetic nervous system, and gray matter is associated with the parasympathetic nervous system. e. all of these are true.
Which statement is true of DNA’s structure?
a. The hydrogen bonding of cytosine to guanine is an example of complementary base pairing. b. In DNA, adenine always base pairs with guanine and cytosine always base pairs with thymine. c. Each of the four nucleotides in a DNA molecule has the same nitrogen-containing base. d. When adenine base pairs with thymine, they are linked by three hydrogen bonds. e. All four bases in DNA can be found in equal quantities.