Question

10:28 Edit 7:09 AM 6. 12. Chemicals unique to the cell walls of Gram+ bacteria; serve to make the cell wall more rigid-two words 13. Taxonomic domain that includes elm trees 16. Study of the evolutionary history of organisms; establishes 18. One of two magnifying lens on a compound microscope-two Gr 15. 21. Inclusion body that allows aquatic bacteria to float to the 23, Structures found in Gram-cells (but not Gram + cells) and allow transport of toxic chemicals from the periplasmic space 26. An acellular microbe 27. Cellular structure found in eukaryotes; serves as site of ATP 28. One of two taxonomic domains that include prokaryotes 29. Two subunit structure found in both eukaryotes and prokaryotes; serve as the site of protein synthesis
Help with 21,23,26,27,28,29

Answer 1

21. ANS: GAS VACUOLES

It is an internal structure in prokaryotes that is made up of a single protein and is impermeable to water but permeable to gas. Moreover, it allows bacteria to float to the surface, therefore providing buoyancy for aquatic bacteria.

23. ANS: PORINS

It is found only in gram negative bacteria. It provides channels for small molecules to pass through.

26. ANS: VIRUS

Acellular means "cell free".

27. ANS: Eukaryotic cells have membrane enclosed organelles, nucleus, multicellular and single cell organisms.

28. ANS: Prokaryotic cells have no membrane enclosed organelles, only one membrane entire cell, single cell organisms,

29. ANS: Plasma membrane and cytoplasm.

The cells of all prokaryotes and eukaryotes possess two basic features : a plasma or cell membrane and cytoplasm.