Primarygun

Mutation refers to a sudden and permanent change of the DNA of a cell. Only those mutation occurs in gamete can bring along the effect to the filial generation, i.e. offspring. But, then, how does evolution continue as their parents are affected by the environment and cannot carry the varied gene to the next generation? Or Evolution does not involve mutation?

How do mammals react when the environmental temperature is much higher than their body temperature in a short term? I'd think they still consider to increase the heat loss rather than doing to reduce the heat gain.

[Math] P(A\cap B) [/Math] refers to the probability of the event that is favourable to both conditions=P(A and B) Say, A refers to an odd no. and B refers to prime no. A=(1,3,5) and B=(2,3,5) Then, for a dice, favourable outcomes for that P are (3,5)

Sorry, I know what you mean. 1.For the first question, I want to ask "Will it be a induced magnet for that moment in the field?" 4.A compass is a magnet, by using which law can I figure out the final direction of north pole of the needle? Thanks

I am confused of considering a solenoid with current as a magnet or by the Fleming's right-hand rule when doing some problems. Here are some questions I am quite confused with: 1.Will a metal which can be attracted by a magnets be induced to be a magnet when it is put in a magnetic field? 2.Do the above metals have move along the field line when it is attracted? 3.When a magnet is near a solenoid with current, the current cause the solenoid to form a magnets. Hence, there's an attractive forces between them. But, when the magnet moves towards it, by Fleming's right-hand rule, the solenoid will repel it, so what's the net movement of the two things? 4.Why do compasses point towards magnetic south pole instead of moving towards it? Thanks

Thanks This is not considered as using the first principle. The approach in post 6 is

A strong oxidizing agent does not necessarily mean that it reacts very fast, right?

Thanks

I only knows field lines come from north pole to south pole. For a straight current carrying wire, there's no pole there, so I am not able to figure it out, may you elaborate more?

Find the derivative of [Math]x^{1/3}[/Math] by the first principle. May anyone show me the steps?

I just thinking of one thing: If sodium chloride is used to displace some soap out of the water and make them float to the surface, how does it work>? The salt is supposed not to affect the solubility of soap much, or I am wrong? http://www.scienceforums.net/forums/showthread.php?t=15519

When there are two current-carrying wires are put together facing the same direction on the same plane going through a paper perpendicularly, what will be the magnetic field observed on the paper?

Can a spoonful of sugar dissolve into a saturated solution of salt? Though this question consists of several words only, I couldn't figure it out.

When we make soap, why do we add con. sodium chloride? How does it work? And does the cation (K+) of the "head" of a soap molecule dissolve in water?

Is oleum more dangerous than con. sulphuric acid? Does it relate to their oxidation no. of the sulphur?

Oxygen supports burning but itself cannot be called flammable, isn't it?

Anyway, thank you YT

lim x-->0 [(1/x)+x] Can I split it into limx-->(1/x) + limx--->0 (x)? A principle said it can if both of the functions exist. But does the former exist?

Then, I have to study the group in which propeneoic acid is.

I thought ester was made by reacting alkanol and alkanoic acid. But this name contains [ene], so I find it difficult for me to name it. Can anyone teach me?

http://www.bbc.co.uk/science/hottopics/biochemicalweapons/ Take the quiz. A Question:At the start of the movie The Rock, Nicolas Cage is told to inject atropine into his heart shortly before being exposed to sarin gas. Is this: A wise precaution? Unnecessary? Downright stupid?

You're welcome. By the way, I heard that HF can have 35M, but it is a weak acid. HCl is quite "thin".

What's the group that that methyl 2-methylpropeneoate belong? amine, amide, alkene?

It's supposed that the fire triangle does indicate that the raw materials responsible for a fire rather than just starting it, right?

Nitric acid: 70% 16M Hydrochloric acid: 35% 11M H2SO4 can have 98% 18M, we usually use the acid of this con. to absorb sulphur trioxide to form oleum. The percentage shows the mass by the acid molecule, so the later measure( molarity)can show the acidic power more accurately I think.