Sbi3Ue Exam Notes

• *Compare and contrast the structure and function of DNA and of RNA molecules. Reference Table 4.1.

Cell Theory is an explanation that says everything is made of cells. It continues on to say that those cells came from preexisting cells. Cell Theory is a theory because it is a frame-worked explanation of an observation made by many biologists like Anar Van Leeuwenhoek. Van Leeuwenoek studied plant stems, pond water, and gathered a conclusion that generally, all of those things are made of cells. Other biologists like Louis Pasteur added onto this idea that all organisms are composed of cells. A theory is also composed of two components; a sequence of patterns in the world and the thing or catalyst that is responsible for the pattern. The sequence of the pattern in Cell theory is that every organism in the world are made up of cells.

Which solution has a pH closest to neutral? (Stomach acid; blood; lemon juice; soap, household bleach)

Discussion: Cells need waterthis cell was hypertonic, meaning the solution had more solute; these cells were hypotonic, meaning the solutions had less solute; these cells were isotonic, meaning the solution had equal solute.

The author explains the basics of DNA by describing the simple part of it, “proteins are the molecules that do all of the work in every organism, from carrying oxygen, to building tissue, to copying DNA for the next generation” (Carroll 73). He also explained the four bases that are building blocks that are held together by strong bonds and are represented by the letters A, C, G and T. Scientist also learned that A and T always pair with each other as well as G and C, this helps them because if they know one strand of DNA they already know the second because of how the bases match up. The author states that scientists have found about 500 genes that exist in all forms of life, the author explains that these genes are “immortal”. These genes have endured millions of years of evolution and have not been mutated because they are essential for every organism to have; these genes can have important jobs such as decoding of the DNA and RNA and making

During the Late Kaskaskia (Cratonic Sequence 3), what type of deposition predominated on the craton?

Molarity – the concentration of a solution expressed in moles of solute per liter of solution

Osmosis is the passive movement of water from an area of low solute concentration to an area of high solute concentration, normally across a membrane which prevents the movement of solvent. This is a process by which materials may move into, out of, or within cells. Osmosis doesn’t depend on energy provided by living organisms but is affected by the properties of the cell membrane. The rate of osmosis is dependent on such factors as temperature, pressure, molecular properties such as size and mass, and the concentration gradient. In osmosis, the relationship between a solute’s concentration outside of cell and inside of a cell is described in terms of the tonicity of the solution outside of the cell. A cell is in a hypotonic solution when the solute is more concentrated inside the cell and therefore water moves into the cell. In this solution the cell swells as water enters, this may continue until it ruptures or hemolyzes. In the reverse condition, the cell is in a hypertonic solution

Cells are some of the smallest organisms around. All living things consist of cells, and yet they are invisible to the naked eye. Cells are the basic structural and functional units of life. Cells are made up of many different parts which allow them to function properly.

The cell is the smallest unit able to sustain life, and they are often referred to as the building blocks of life. There are two primary types of cell, which are categorized according to the way their genetic material is packaged, rather than size or shape. These are:

here are many different theries presented by very hard working, and deticated scientists relating to biomolecules. This paper is about all the different hypotheses, and how these scientists back them up. There are six hypotheses that I will explain...

All living organisms, from amoebas to humans, have a molecular code called DNA in their cells, which instruct the activities that keep the organism alive. DNA is made up of long, twisted strands of four molecular “letters” (A, T, G, and C), which pair up according to their complementary base pairs, and their order determines how proteins — the vital molecules that perform all the major tasks in our cells — are made. (Refer to Diagram 1 to help sum up the concept.)

The cell. The most basic form of life, and yet the most complex structure Mother Nature has to offer. For hundreds of years, man has tried to crack its codes, to try and find what makes it tick; but it seems that the deeper we go into the study of cells, the more questions appear too. The purpose of this entire essay is to educate my readers on cells, our discovery of cells and the cell theory, where we believe they first appeared, and how we have learned to manipulate cells to cure diseases like cancer. I will also talk about how our knowledge of cells has changed our medicine and agriculture, and how ethnic some of these changes are.

What is the cell theory? The cell theory states three main things: Every living thing is made up of one or more things, cells carry out the functions needed to support life, and cells come only from other living cells. The cell theory gives us a foundation for our knowledge about living things, and what they do. The process of developing the cell theory took about 200 years. Along the way, we can see examples of tenets of the nature of science being used. The three main tenets of the nature of science are: Scientific ideas are durable, science demands evidence, and scientific knowledge is subject to change.

The process of DNA replication plays a crucial role in providing genetic continuity from one generation to the next. Knowledge of the structure of DNA began with the discovery of nucleic acids in 1869. In 1952, an accurate model of the DNA molecule was presented, thanks to the work of Rosalind Franklin, James Watson, and Francis Crick. To reproduce, a cell must copy and transmit its genetic information (DNA) to all of its progeny. To do so, DNA replicates following the process of semi-conservative replication. Two strands of DNA are obtained from one, having produced two daughter molecules that are identical to one another and to the parent molecule. This essay reviews the three stages