Cells that provide direct protection and physical support to neurons are
A) located only in the spinal fluid.
B) found primarily in lymphatic fluids.
C) myelinated.
D) neuroglial cells.
E) nodes of Ranvier.
D
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What nucleic acid is subject to alternative splicing?
A. DNA B. rRNA C. pre-mRNA D. mRNA E. tRNA
The structures labeled "4" are
a. trichocysts. b. cilia. c. flagella. d. pili. e. pellicles.
If a sieve tube in a plant becomes blocked, the plant
will experience difficulty in a. carrying on transpiration. b. transporting minerals. c. translocating food throughout the plant. d. completing cell division and experiencing normal growth. e. healing wounds.
Which of the following is not an accessory pigment used to absorb photons that cannot be captured by chlorophyll?
A) ?-carotene B) phycoerythrin C) lutein D) phycochlorophyll E) phycocyanin