a special region of the chromatin where rRNA is produced and where proteins from the cytoplasm gather to form ribosomal subunits.
What will be an ideal response?
nucleolus
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Aquatic invertebrates excrete , a very toxic waste product, directly into the water.
A. urea B. nucleotides C. uric acid D. ammonia E. allatonin
Cell-mediated immunity most directly involves the destruction of diseased and/or cancerous cells by ____________
Fill in the blank(s) with the appropriate word(s)
The two major divisions of the vertebrate nervous
system are the a. autonomic and peripheral systems. b. sympathetic and parasympathetic systems. c. cranial and spinal nerves. d. central and peripheral nervous systems. e. brain and spinal cord.
Prokaryotic cells are smaller than eukaryotic cells. What is a plausible explanation?
A. Prokaryotes lack the genetic material needed for protein synthesis. B. Prokaryotes have more diverse energy sources. C. Eukaryotes have compartmentalization, which allows for specialization. D. Prokaryotic cell walls limit their cell growth. E. Eukaryotes are immobile allowing them to grow larger.