Which of the following statements is true? gram-positive bacteria have a single cell wall anchored to the cell membrane by lipoteichoic acid. porins allow entry of substances into both gram-positive and gram-negative bacteria. the cell wall of gram-negative bacteria is thick, and the cell wall of gram-positive bacteria is thin. gram-negative bacteria have a cell wall made of peptidoglycan, whereas gram-positive bacteria have a cell wall made of lipoteichoic acid.

Gram-positive bacteria have a single cell wall anchored to the cell membrane by lipoteichoic acid.

Explanation:

According to Gram stain test, bacteria can be divided into two main groups which differs mostly in the structure of the cell wall"

answer: tributaries flow into rivers.

wetland is a biome that develops when the water gets accumulated in a land exhibiting a huge depression. these form either seasonally or permanently. the water in the wetland comes from rivers, lakes, ocean, flood, rain or other sources. the wetlands includes mangroves, marshes and peatland.

tributaries flow into the rivers develops a wetland because such water will get deposited in the depression and will restrict the original flow of tributary water. hence, water with low drainage current combines with the river water.

thinking it would be fimbriae