Answer:
False
Explanation:
Lipopolysaccharides are substances that have both lipid and polysaccharide. LPS layer is the characteristic feature of gram-negative bacteria. The LPS layer is present in the outer membrane of the cell envelope of gram-negative bacteria. It is not found in Gram-positive bacteria.
Broad-spectrum drugs are the chemotherapeutic agents that are effective against several kinds of pathogens while the narrow spectrum drugs target only a limited type of microbes. Therefore, an antibiotic that attacks the LPS layer would be effective against Gram-negative bacteria only which in turn makes it a narrow-spectrum drug.
About 88 percent of geologic time is represented by the time span called the precambrian <span>era.</span>
Answer:
When HIV infects a cell, it first attaches to and fuses with the host cell. Then the virus uses the host cell's machinery to convert the viral RNA into DNA and replicate itself. The new copies of HIV then leave the host cell and move on to infect other cells.
Answer:
B
Explanation:
Cumulative means that someone came up with an idea first and someone later built an idea off of that. Kepler basing his laws off of Newton's laws is the only option that uses cumulative knowledge. Everything else is either completely independent or working together neither of which is cumulative.
