Recent content by nicholaschean

I came across this question in my assignment asking this and i am not sure if they represent activators or repressors because the question jus stated that "Oct 4, Sox 3 are transcription factors that are present in stem cells only. Explain what type of transcription factors they represent."...

The correct answer states its C which i understand why since doubling the intiial volume of SO2 is equivilent to doubling the intial moles of SO2 hence the moles of SO3 produced will also increase and hence pressure exerted shld be higher than before which is not reflected by the graph...

I know that telomeres are found on the ends of DNA molecules as stated by my notes. But i was wondering if they are only found on the 3' ends or both 5' and 3' because since DNA is double stranded, if it were to be found on both 5' and 3', one parental strand will be...

The question is on top liao. As for the attempt, it is the 2nd post

Hmm i hav a 2nd attempt though and i think it shld be correct: Let r be a recessive allele. A person with albino will be rr. Therefore, this wil duplicate during interphase resulting in 2(rr). Therefore, each pole will have 2(r). Therefore ans is C.

Homework Statement Albinism in humans is controlled by a recessive allele. How many copies of this allele will be found at one of the poles of a cell at telophase I of meiosis in an albino person. A.23 B.4 C.2 D.1 Homework Equations The Attempt at a Solution Let rr be the recessive...

Homework Statement Why is petrol suitable to be used as a fuel whereas lubricating oil is more suited to lubricate machine joints? Homework Equations The Attempt at a Solution Petrol has a low boiling point. It combusts more easily to provide energy to the car. However...

So cna i say that Student Y probably used lithium with a larger surface area

Hmm so all around, how do i put all this as a sentence to conclude the 2nd possible reason?

I see..Sorry but could you please explain again what the surface area does?

From my current syllabus, all i know is that the factors affecting speed of reaction are: -Surface Area(Powdered vs Granulated) -Concentration(High=faster,low=slower) -Temp(High=faster,low=slower) -Pressure(High=faster,low=slower) -Catalysts(High=faster,low=slower) And i also know that...

Being in Secondary 4 this year, could i rephrase this portion as presence of impurities in the lithium?

Hmm but how does oil cause reactant amount to increase cos looking at the graph, for the first 40s, a increasing gradient is observed which signifies a increase in amount of reactants where there are more and more.

Sorry for the confusion, was a typo i meant granulated lithium. Well, most granulated reactant provided are usually not spherical to perfection and are mostly irregularly. And i guess that among all the factors that affect speed of reaction, I think surface area is really the desirable one that...

hmm i asked a senior and he suggested the 2nd reason to be particle size. As Student Y could be using granulated zinc whereby the reaction speed increases as it goes cos need break down the granulated into powdered then once its powdered it becomes fast shortly due to larger surface area and...