Answer:
The correct answer to the question: Regarding plasma membranes, which of the following statements is false, would be, B: The thickness of the plasma membrane is only about 1 nm.
Explanation:
The plasma membrane is the structure of the cell that provides a protective barrier, between a cell´s intracellular environment and the extracellular matrix. Furthermore, aside from providing structural support, and protection, a cell´s membrane also serves as a communication media between the cells, and between a cell and all other elements outside of it. This membrance is formed by a phospholipid bilayer, with a space in between the two layers where the tail ends meet and it also has in its structure cholesterol and other lipids that allow the membrane to be fluid, but also structurally strong. However, what is not true is the thickness, as it is known that plasma membranes´ thickness actually lies between 7.5 to 10 nm, and not merely 1 nm. This is why the answer is B.
Answer:
The moving of water causes erosion, deposition and much more!
Explanation:
Water moving across the earth in streams and rivers pushes along soil and breaks down pieces of rock in a process called erosion. The moving water carries away rock and soil from some areas and deposits them in other areas, creating new landforms or changing the course of a stream or river.
Answer:
Yes, P. Falciparum and T. Cruzi undergo similar antigenic variation because of repetitive genomes evolved by time.
Explanation:
Living (i.e., actively proliferating) repeats are dynamic elements which reshape their host genomes by generating rearrangements, creating and destroying genes, shuffling existing genes, and modulating patterns of expression. Dead repeats (i.e., those which are no longer able to proliferate) constitute a palaeontological record, which can be mined for clues about evolutionary events and impetus. The dynamic nature of repeats leads to a rapid evolutionary divergence that can be used in species identification and phylogenetic inference. Repeats can also provide passive markers for studying processes of mutation and selection.
The genomes of these protozoan parasites, like all eukaryotic genomes, have been colonized by diverse repetitive elements. Repetitive sequences can be artificially divided into two groups: interspersed repeats and tandemly repeated DNA. P. falciparum undergoes antigenic variation ans similar anitgenic variation is present in t. cruzi because of repetitive sequences resembling each other.
All of them are close in the membrane pass-through each other
Answer:
The scientist raises a question about cellular phenomena that is tested by a hypothesis-led procedure, and the resulting information may then be used to find the reasons for his observations
Explanation:
The scientific method is a rigorous process that involves a series of steps: 1-to make observations about the real world, 2-to ask a question related to these specific observations, 3-to raise a working hypothesis, 4- to test the hypothesis, 5-to analyze the results and 6-to obtain conclusions (i.e., reject or confirm the hypothesis). In the scientific method, a scientific question must be measurable, defined and testable. Moreover, the scientific hypothesis must be a well-defined and coherent conjecture which is tested by experimental or observational procedures in order to seek answers to the scientific question.
