Viruses are ______ -coated fragments of DNA or RNA.
Fill in the blank(s) with the appropriate word(s).
protein
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Polarized cells are characterized by
A) random orientation within a tissue. B) a polar flagellum. C) random orientation within an organ. D) distinct apical and basolateral sides. E) both choices B and D
What are the three glands that produce the liquid portion of semen?
A. prostate, seminal vesicles, bulbourethral B. hypothalamus, prostate, Leydig C. Leydig, prostate, bulbourethral D. seminal vesicles, hypothalamus, bulbourethral E. seminal vesicle, Leydig, hypothalamus
What three features serve to distinguish vascular plants from nonvascular plants?
What will be an ideal response?
Which structure in bird and mammalian embryos functions like the blastopore of frog embryos?
A) primitive streak B) neural plate C) archenteron D) notochord E) somites