A limiting factor is a factor that controls a process. Light intensity, temperature and carbon dioxide concentration are all factors which can control the rate of photosynthesis. Usually, only one of these factors will be the limiting factor in a plant at a certain time. This is the factor which is the furthest from its optimum level at a particular point in time. If we change the limiting factor the rate of photosynthesis will change but changes to the other factors will have no effect on the rate. If the levels of the limiting factor increase so that this factor is no longer the furthest from its optimum level, the limiting factor will change to the factor which is at that point in time, the furthest from its optimum level. For example, at night the limiting factor is likely to be the light intensity as this will be the furthest from its optimum level. During the day, the limiting factor is likely to switch to the temperature or the carbon dioxide concentration as the light intensity increases.
Falk (1986) explicitly asked philosophers and historians ofbiology, “What is a Gene?” Discoveries such as overlappinggenes, split genes, and alternative splicing (discussed in ) made it clear that simply equating agene with an uninterrupted stretch of DNA would no longer capture thecomplicated molecular-developmental details of mechanisms such as geneexpression (Downes 2004). In an effort to answer Falk’squestion, two general trends have emerged in the philosophicalliterature: first, distinguish multiple gene concepts to capture thecomplex structural and functional features separately, or second,rethink a unified gene concept to incorporate such complexity. (For asurvey of gene concepts defended by philosophers, see Griffiths andStotz 2007, 2013.)
Review (1 page) Concept 2: The Lactose Operon
Francis Bacon (Bacon 1620, 70) said that allowing one’s commitment toa theory to determine what one takes to be the epistemic bearing ofobservational evidence on that very theory is, if anything, even worsethan ignoring the evidence altogether. HD, Bootstrap, Bayesian, andrelated accounts of conformation run the risk of earning Bacon’sdisapproval. According to all of them it can be reasonable foradherents of competing theories to disagree about how observationaldata bear on the same claims. As a matter of historical fact, suchdisagreements do occur. The moral of this fact depends upon whetherand how such disagreements can be resolved. Because some of thecomponents of a theory are logically and more or lessprobabilistically independent of one another, adherents of competingtheories can often can find ways to bring themselves into close enoughagreement about auxiliary hypotheses or prior probabilities to drawthe same conclusions from the evidence.
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Kandace’s topic is exponentials, since her students are already familiar with multiplication, they have a good background before starting this topic.”
It must be very clear.
It is there to guide your thinking.
It must be appropriate for the grade you are teaching.
“Deona and Sarah are both teaching the concept of photosynthesis.
Concept 9.5 - Photosynthesis | The Open Academy
In the 1970s, as many of the leading molecular biologists weremigrating into other fields, molecular biology itself was goinggenomic (see the entry on genetics and genomics). The genome is acollection of nucleic acid base pairs within an organism’s cells(adenine (A) pairs with thymine (T) and cytosine (C) with guanine(G)). The number of base pairs varies widely among species. Forexample, the infection-causing Haemophilus influenzae (thefirst bacterial genome to be sequenced) has roughly 1.9 million basepairs in its genome (Fleischmann et al. 1995), while theinfection-catching Homo sapiens carries more than 3 billion basepairs in its genome (International Human Genome Sequencing Consortium2001, Venter et al. 2001). The history of genomics is the history ofthe development and use of new experimental and computational methodsfor producing, storing, and interpreting such sequence data (Ankeny2003; Stevens 2013).
The Evolution of the Cell - Learn Genetics
The field of molecular biology studies macromolecules and themacromolecular mechanisms found in living things, such as themolecular nature of the gene and its mechanisms of gene replication,mutation, and expression. Given the fundamental importance of thesemacromolecular mechanisms throughout the history of molecular biology,a philosophical focus on the concept of a mechanism generates theclearest picture of molecular biology’s history, concepts, andcase studies utilized by philosophers of science.