Photoautotrophs can synthesize sugar using inorganic source of carbon and sunlig
ID: 83665 • Letter: P
Question
Photoautotrophs can synthesize sugar using inorganic source of carbon and sunlight as an energy source. Bacterial cell walls are composed of polysaccharide similar to cellulose. Chemoheterotrophs synthesize sugar by ingesting inorganic sources of carbon and using the energy released from oxidation of reduced compounds. Endosymbiosis is the likely explanation for the evolution of the nuclear membrane. All members of the kingdom Fungi reproduce both sexually and asexually. A cephalized animal has sense organs concentrated at its dorsal end. A poikilohydric organism is one whose temperature varies with changes in the environment. Although plants excrete oxygen and animals excrete carbon dioxide, both plants and animals generally excrete a nitrogenous waste. The apoplast of plants is analogous to the intercellular fluid of animals. Ectothermic organisms are also homoeothermic. To conserve heat, plants and animals living arctic regions would tend to be more compact and rounder than those living in tropical regions. Gametes are produced in gametophytes that are part of a gametangial plant. Antheridia and archegonia are spore-producing structures on the sporophyte plant. Trees, including specimens such as maple, oak or spruce, are the haploid sporophyte portion of a life cycle. Both conifers and flowering plants are heterosporous, producing kinds of two gametophytes. The first vascular plants had a central core of vascular tissue made of fibers and continuous vessels.Explanation / Answer
1. True..........
2. True............
1. Peptidoglycan, also known as murein, is a polymer consisting of sugars and amino acids that forms a mesh-like layer outside the plasma membrane of most bacteria forming the cell wall.
2. Peptidoglycan helps maintain the structural strength of the cell.
3. Gram-negative bacteria such as Escherichia coli break down and reuse over 60% of the peptidoglycan of their side wall each generation.
4. It is shown that all of the amino acids and amino sugars of peptidoglycan are recycled.
5. Nine enzymes, one permease, and one periplasmic binding protein in E. coli that appear to have as their sole function the recovery of degradation products from peptidoglycan, thereby making them available for the cell to resynthesize more peptidoglycan or to use as an energy source, have been identified.