Answer: D
Explanation:
The lipopolysaccharides are found in the outer membrane of Gram-negative bacteria. Lipopolysaccharide is complex molecule consisting of a lipid and chains of carbohydrates. They are also called endotoxin, they are the major component of the outer cell membrane. Sugars in the polysaccharide chains of endotoxin confer serologic specificity. They lplay a crucial role in bacteria resistance to antibiotics.
The correct answer is A. Permian.
Explanation
The synapsids were terrestrial vertebrate mammals or animals related to them rather than to reptiles or birds that lived during the Permian (a period that began about 299 million years ago and ended about 251 million years ago) and were the dominant terrestrial vertebrates during it. These animals survived until the Triassic; however, due to the Permian-Triassic extinction, they were not the predominant vertebrate as in the previous period. Later, during the Cretatic and Jurassic periods, their development was minimal and did not have great importance as reptiles were dominant in this period. So, the correct answer is A. Permian.
Answer:
A point mutation is a mutation that is caused by a change in a single base pair in a gene sequence. It affects only one or a few base pairs or sequences by insertion, duplication, deletion, or translocation.
This type of mutation leads to the protein created by the gene if one part of the protein is removed or added. It can affect the protein and leads to several diseased cases or synfroms.
Answer:
Animal cells also take in and lose water by osmosis. They do not have a cell wall, so will change size and shape when put into solutions that are at a different concentration to the cell contents. Red blood cells lose water and shrink in a concentrated solution. They swell and burst in a solution that is too dilute.
Answer:
skeletnog
Explanation:
El tórax es la parte superior del tronco que se encuentra entre el cuello (collum) y abdomen. Lla aleta pectoral tiene la forma de una pila con flecos de ropa aplastada al revés. En la cavidad del cabello torácico (eavitas thoracis) se encuentran los órganos vitales: el corazón y los pulmones.
Los huesos de las paredes del esternón son: el esternón, las costillas y las vértebras torácicas.
