Marine snow is an important source of food for many pelagic organisms
Indicate whether the statement is true or false
T
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Poliovirus receptors are found
A. in spinal cord anterior horn cells only. B. in cells of all tissues. C. in gut cells only. D. in nasopharynx, gut, and spinal cord anterior horn cells.
The fossil remains of animals with body plans recognizable as arthropods, echinoderms, mollusks, and other bilaterians first appeared during the _____ Period, around _____ million years ago
A. Ediacaran; 575 B. Cambrian; 542 C. Devonian; 420 D. Devonian; 360 E. Permian; 100
Which of the following statements in TRUE?
A. Many active genes are found in euchromatin, because proteins involved in transcription can easily access these regions of DNA. B. Euchromatin, found in interphase cells, is readily visible and easily viewed. C. A region of DNA is either heterochromatin or euchromatin, it cannot go back and forth between the two forms. D. When DNA is being replicated, the chromosomes are composed chiefly of heterochromatin. E. All choices are correct.
What is an autoimmune disease?
What will be an ideal response?