The predatory bacterium, Bdellovibrio bacteriophorus, drills into a prey bacterium and, once inside, digests it. In an attack up
on a gram-negative bacterium that has a slimy cell covering, what is the correct sequence of structures penetrated by B. bacteriophorus on its way to the prey's cytoplasm? 1. membrane composed mostly of lipopolysaccharide 2. membrane composed mostly of phospholipids 3. peptidoglycan 4. capsule
1 answer:
Answer:
1.capsule
2.membrane composed mostly of lipopolysaccharide
3.membrane composed mostly of phospholipids
4.peptidoglycan
Explanation:
The cell wall of gram-negative bacteria is located outside the cell membrane and is composed of a single layer of peptidoglycan, followed by a second membrane composed of phospholipids (often called outer membrane) and finally a lipopolysaccharide layer, these three elements constitute the gram-negative envelope. Also, some bacteria produce a viscous secretion that spreads in the surrounding environment, forming a slime layer known as a capsule.
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Answer:
3/4 purple : 1/4 white
Explanation:
The pure breeding parent plants have genotype PP and pp. The plant with the "PP" genotype will make all the gametes with the "P" allele while the plant with "pp" genotype will make all the gametes with the "p" allele. The random fusion of these gametes produces F1 progeny with the "Pp" genotype and purple phenotype. A cross between two F1 plants (Pp x Pp) produce progeny in the following phenotype ratio=
Pp x Pp = 3/4 purple : 1/4 white
