Which Of The Following Statements About Cyanobacteria Is True

Which of the following examples best represents the evolutionary definition of a species? A possible answer is: Bacteria contain peptidoglycan in the cell wall; archaea do not. Reid RP, Visscher PT, Decho AW, Stolz JF, Bebout BM, Dupraz C, Macintyre IG, Paerl HW, Pinckney JL, Prufert-Bebout L, Steppe TF, DesMarais DJ: The role of microbes in accretion, lamination and early lithification of modern marine stromatolites. In eukaryotes, functional variety appears to be largely carried by the large numbers of different kinds of actin-binding and tubulin-binding proteins that are present [83, 84]. Which among the following statements is TRUE regarding cyanobacteria. However, prokaryotic cells sometimes need to increase membrane surface area for reactions or concentrate a substrate around its enzyme, just like eukaryotic cells. That's because oxygen wants to react; it can form compounds with nearly every other element on the periodic table. In the case of bacteria, it is a fatty acid; in the case of archaea, it is a hydrocarbon (phytanyl). The phylum chordata has a few key characteristics. Although common in laboratory populations of bacteria, it does not play an important role in natural bacterial populations. This has been seen for at least two of the eukaryotic cytoskeletal homologs associated with independent DNA elements in bacteria, an actin homolog that is encoded by a plasmid [80] and a tubulin homolog that is encoded by a bacteriophage [81].

1. Which of the following statements about cyanobacteria is true weegy
2. Which of the following statements about cyanobacteria is true apex
3. Which of the following statements about cyanobacteria is true religion outlet

Which Of The Following Statements About Cyanobacteria Is True Weegy

The use of prokaryotes that can fix nitrogen. Prokaryotes are tiny, but in a very real sense, they dominate the Earth. Curr Opin Cell Biol. All living things can be divided into three basic domains: Bacteria, Archaea and Eukarya. The flamingos had previously been studied for many years due to their fascinating foraging habits.

Our eukaryotic cytoskeletons figured out how to do this by setting up large-scale arrays that can be oriented by virtue of having nucleators and molecular motor proteins to make those type B structures that are so useful for spatial organization over vast distances of many tens of micrometers. Because bacteria have circular DNA, they don't have those problems. Komeili A, Li Z, Newman DK, Jensen GJ: Magnetosomes are cell membrane invaginations organized by the actin-like protein MamK. Annu Rev Biophys Biomol Struct. During early development, the formation of the blastopore leads to the growth of the digestive tract. Which of the following statements about cyanobacteria is true weegy. An organism's evolutionary "fitness" depends on its ability to reproduce and create viable offspring, or contribute its genes to future generations. Yes, or might evolve. In sickle-cell disease, a single point mutation in hemoglobin changes one charged residue on the surface to a neutral residue [64], and now in this dense cellular bag of the erythrocyte, filled almost entirely with one protein, you have a condition where the oxygen-depleted form of hemoglobin is able to self-assemble into a spectacularly beautiful helical structure with 14 protofilaments that looks absolutely classically like a microtubule or some other cytoskeletal filament [63] (Figure 3b). All of the really exciting inventions in biological chemistry, I would say, have been generated in the prokaryotic branches of the tree.

What type of prokaryotes, in terms of their metabolic needs (autotrophs, phototrophs, chemotrophs, etc. This includes lots and lots of different ATPases and GTPases that are found in all domains of life. Which of the following statements about cyanobacteria is true religion outlet. A white-feathered flamingo mates with a pink-feathered flamingo, and produces a pink-feathered flamingo offspring. In the absence of nucleators you can obviously make a single filament of essentially any length and that single filament can have many protofilaments. They are perfectly good at governing the dynamics of those structures. 2011, 108: 11075-11080.

Which Of The Following Statements About Cyanobacteria Is True Apex

Large animals such as dinosaurs. Bacteria have a ton of energy; I don't know of any cases where ATP availability is limiting for any normal biological process. One major reason we're never going to know is that all existing eukaryotes are very similar in many ways that must have come much, much later than that original separation of the eukaryotic lineage from the bacterial and archaeal lineages, suggesting that our most recent eukaryotic common ancestor was already quite a bit different from the original eukaryote and probably much more morphologically complex. Your friend believes that prokaryotes are always detrimental and pathogenic. Eubacteria is single-celled prokaryotic microorganisms which have a variety of features and are present in all regions of the world in diverse environments. Prokaryotes typically have peptidoglycan containing cell walls, which is discussed in this article under the heading The cell wall. B. Prokaryotes living in the food products will take in excess water and explode. Over time, people came to realize that staying apart from afflicted persons, and disposing of the corpses and personal belongings of victims of illness, reduced their own chances of getting sick. Prokaryotic cells are much smaller than eukaryotic cells, have no nucleus, and lack organelles. Prokaryotes reproduce asexually, resulting in the offspring being an exact clone of the parent. Which of the following statements about cyanobacteria is true apex. Cells in general are small, but prokaryotic cells are really small. For some untold eons prior to the evolution of these cyanobacteria, during the Archean eon, more primitive microbes lived the real old-fashioned way: anaerobically.

Volkmann N, Amann KJ, Stoilova-McPhie S, Egile C, Winter DC, Hazelwood L, Heuser JE, Li R, Pollard TD, Hanein D: Structure of Arp2/3 complex in its activated state and in actin filament branch junctions. Kull FJ, Sablin EP, Lau R, Fletterick RJ, Vale RD: Crystal structure of the kinesin motor domain reveals a structural similarity to myosin. So those kinds of structures you can make regardless of whether you are a bacterium or a eukaryote and regardless of the presence of nucleators or motors. Which of the following statements is/are true. Additionally, bacteria can be taken up in the water that plants are grown in, thereby entering the plant tissues rather than simply residing on the leaf surface. In brief, this impressively dynamic and very precise system that the bacterial cell uses to choose the site of division depends on the spontaneous nucleation of one filamentous structure (MinD) that is destabilized by a regulator (MinE).

Chemosynthetic autotrophic eubacteria oxidise various inorganic substances such as nitrates, nitrites and ammonia and use the released energy for their ATP production. Aggregation of globular proteins. Chen S, Beeby M, Murphy GE, Leadbetter JR, Hendrixson DR, Briegel A, Li Z, Shi J, Tocheva EI, Müller A, Dobro MJ, Jensen GJ: Structural diversity of bacterial flagellar motors. For most of the other examples of bacterial cytoskeletal filaments, too little is known about their dynamics to enable us to guess how the nucleation versus stabilization equation will play out. They comprise the majority of living things in all ecosystems. Which of the following statements about cyanobacteria is false? a. Some species form chains of cells. b. They are prokaryotes. c. They have chloroplasts. d. Some species can fix nitrogen to ammonia. | Homework.Study.com. 1999, 126: 2117-2127. What does that mean for us? There is evidence to suggest that eukaryotes are the descendants of separate prokaryotic cells, according to Berkeley University of California.

Which Of The Following Statements About Cyanobacteria Is True Religion Outlet

Prokaryotic cells and eukaryotic cells are the two types of cells that exist on Earth. Consortium TEP: An integrated encyclopedia of DNA elements in the human genome. For example, Bacillus subtilis has three different chromosomally encoded paralogs, each of which is homologous to actin, MreB, Mbl, and MreBH, that appear to have somewhat overlapping functions [40]. A microtubule is a single filament with 13 protofilaments that can be arbitrarily long. What would be the best evidence that A and B have a more recent common ancestor than A and C or B and C?

Now there are two really nice things about helices. Kollman JM, Polka JK, Zelter A, Davis TN, Agard DA: Microtubule nucleating γ-TuSC assembles structures with 13-fold microtubule-like symmetry. Some prokaryotic cells also have pili, which are adhesive hair-like projections used to exchange genetic material during a type of sexual process called conjugation, according to Concepts of Biology. So how did Earth end up with an atmosphere made up of roughly 21 percent of the stuff? Most eukaryotes also reproduce sexually (although some protists and single-celled fungi may reproduce through mitosis, which is functionally similar to asexual reproduction). Cyanobacteria are also named Blue-green algae. Prokaryotes generally have a single circular chromosome that occupies a region of the cytoplasm called a nucleoid. In a deep-sea hydrothermal vent, there is no light, so prokaryotes would be chemotrophs instead of phototrophs. The plasma membrane. A disease that is constantly present in a population is called _____. Dynamic actin assembly and disassembly are necessary for phagocytosis, to separate a large membraneous organelle from the plasma membrane compartment, and to also capture an endosymbiont [20].

Populations A and B share similar mtDNA sequences, but differ in their nDNA sequences. I think the fact that you see that both the diversification of the important NTPase families and the elaboration of cytoskeletal functions seem to be universal among eukaryotes means that probably those things happened relatively quickly. Can eukaryotes have flagella and pilli? 05322. x. Miller KG, Field CM, Alberts BM: Actin-binding proteins from Drosophila embryos: a complex network of interacting proteins detected by F-actin affinity chromatography. 1016/S0960-9822(02)00716-9. They often form blooms in polluted water bodies. Like regulated nucleators, cytoskeletal motor proteins can cooperate with their filaments to generate very large-scale structures. They seem to be immortal and divide without any limits.

This diversification may have happened very quickly on an evolutionary scale. 2001, 276: 11743-11753. And then once we have those kinds of structures and mechanisms, we are able to overcome the diffusion barrier and the increase in size and complexity of eukaryotic cells follows naturally from that. My assertion, and I've really scoured the literature here, is that no type B structures - asters and parallel bundles and spindles - have been observed in the cytoplasm of bacteria (with one very interesting exception which is I think the exception that proves the rule - and I'll come back to that a bit later). Some species form chains of cells. Salt breaks down the chitin contained in the cell walls of prokaryotes. So the question I'd really like to ask is, if bacteria have a cytoskeleton, why don't they do anything more interesting with it? This has been attributed to overfishing using nets with large holes. In contrast, bacteria that have multiple chromosomes seem to segregate them by using independent, orthogonal machineries specific for each chromosome [19], and don't appear to have anything as general or as scalable as a mitotic spindle. They are protostomes. This mechanism rather neatly ensures that ParM filaments forming in a cell will be stabilized to push the plasmids apart only when there are two copies of the plasmid present, one to stabilize each end of the normally unstable filament. These organisms are made of prokaryotic cells — the smallest, simplest and most ancient cells. They would have no problem duplicating and modifying the genes for the cytoskeletal proteins, as they have demonstrated with the proliferation of the different flavors of actin and tubulin homologs that are used in such a wide variety of contexts.

C. It requires movement of DNA through a pilus. Nogales E, Wolf SG, Downing KH: Structure of the alpha beta tubulin dimer by electron crystallography. The first focuses on self-assembly dynamics, and the rules about the kinetics and thermodynamics of self-assembly that come from the intrinsic properties of proteins - can these really be different between bacteria and eukaryotes? In addition to the chromosome, many prokaryotes have plasmids, which are small rings of double-stranded extra-chromosomal ("outside the chromosome") DNA. Oosawa F, Kasai M: A theory of linear and helical aggregations of macromolecules. Having the capacity to carry around and segregate lots and lots of DNA also just gives the eukaryotic cells more options and more flexibility.