Sophie is looking at a small particle through a microscope. it has unique proteins in its cell wall, but no nucleus. it is shaped like a sphere. what is sophie observing? a. a virus b. a bacterial cell c. an archaeal cell d. a host cell

C. an archaea cell

Explanation:

Both bacteria and archaea have a cell wall, but the bacteria cell wall has peptidoglycan. The archaeal doesn't have peptidoglycan, but some unique proteins. They both also don't have nuclei. A virus doesn't have a cell wall, and a host cell, if eukaryote, would have a nucleus.

number of molecules / avogadro's number * molecule molecular = mass

explanation:

we define a gram-molecular weight as the mass of one mole of any element or compound. a mole contains avogadro's number of units (molecules) –  

6.022

x

10

23

. so, dividing the number of molecules by avogadro's number gives us the number of moles. multiplying that by the molecular weight gives us the mass. from the periodic table we find the gram-molecular weight of u to be238 and of f to be19. so,  

u

f

6

will have a gram-molecular weight of 352g.