Homework Help

Can anyone explain how ln(cscx)=0 is solved by pi/2. I thought ln graph can not be 0!

I am new to biology and have been reading about HeLa cells. I understand they were cancer cells and had assumed cancer cells were kind of function less, why is it the case that they can still be infected with such viruses? I am supposed to write about why HeLa cells were useful for polio research and am reading that they 'responded' well to the virus under culture, this is just a side thought that I'd like to understand. I've possibly worded this badly but just wanted to know how 'active' exactly cancer cells are and why HeLa cells were ideal to use besides their ability to multiply quickly? Thank you in advance, I look forward to being enlightened!

What is the solubility of silver salt of the formula RCOOAg (RCOO=phenylbutyrate, DMF, MeOH, water?)

I'm halfway through Calculus 1 and I've learned nothing. I've had some serious problems with motivation and energy this semester and have literally put ZERO time into studying. It's starting to worry me because I'm afraid I can't play catch up now. But I thought starting was better than not starting. So I would like it if someone could please get me on the right track to understanding what I'm doing. What is the point of calculus? (I understand it to be the mathematical study of change) What is a limit? What is a derivative? What does it mean to differentiate? What is an integral? What way of thinking will help me understand calculus better? Pe…

I am aware a set is Bounded if it has both upper and Lower bound and i know what a Limit point of a set is but how can i show that If S ⊂ R be a "bounded infinite set", then S' ≠∅

Let S = [0,1]. If x and y are in s with x ≠y. How can we show that there are m,n∈N such that x< m/2^n <y. Can the Archimedean Property be used to prove this? If yes, could anyone provide me an insight to do this?

the mass of a WHAT isotopes is chosen as the reference standard to give the relative isotopes mass of a particular isotope of an element

your body may begin to relax on the way home. This relaxation reflects activity of the ____ nervous system. a) voluntary b) somatic c) sympathetic d) parasympathetic

Treating a patient with parkinsons disease with a drug that increases dipamine activity too greatly could lead to symptoms of a) depression b) paralysis c) schizophrenia d) autism

homework.pdf Hi I’m having trouble to devise an experiment to carry out this task: An insert is available containing a gene within it whose orientation and exact position with the insert are unknown. The gene contains a sequence for an important small peptide hormone. No DNA sequence info is available. The insert containing the peptide gene is a blunt end fragment of 1.8kb that was not generated with a restriction enzyme. The gene does not have a promoter and there is 6* his tag at the C-terminus of the open reading frame.

500 mL of 0.20 M solution of Ammonia is mixed with 500 mL of 0.20 M solution of HBr. What is the pH of the resulting solution of NH4Br? Ok, so I know the general math required. I'm just not sure how to proceed here. I'm using mostly the book provided and I'm not seeing an example of how to proceed. .20 M / 500 mL = .40 M NH3 + H2O <---> OH- + NH4+ HBr + H2O ---> H3O+ + Br- I know NH3 is a weak base, and HBr is a strong acid. How do I find the pH of a mixture of two different solutions. Seriously my book says nothing about this. Should I just use the formula for NH4Br? What would the k value of NH4Br be? Any help would be greatly ap…

Hi! I'm having trouble with a review question. What is the mass of a single iodine molecule, I2? it says the answer is 4.215x10e-22g and I am trying to figure out how to get that answer.

would someone please help me? I still dont understand how to start a post or what one looks like. This is my first time in college and am taking online classes.

Two identical guitars are played by two persons to give notes of same pitch . Will they differ in quality ? give me reason

What is the largest Hispanic subculture in the United States? a. Venezuelans b. Puerto Ricans c. Mexican Americans d. Cuban Americans

Hello guys, I would like to know what does it mean by classical science? Is it dated back to the early civilization or during the 18th - 19th century? I have been browsing through the internet searching for journals and articles on it but I unable to find the one with good explanation. Is there any other term used to define classical science?. I hope someone can help to explain this to me. Thank you.

For a lab at school, we are given six substances which we have to separate and purify. The substances are benzoic acid, stearic acid, salt, sand, sawdust, and iron. We took out the iron with a magnet already, and got the sawdust out using a balloon and static electricity. However, my group is having trouble separating the rest of the mixture, and we only have one more class period to work on this lab. Also, we have many materials in class, but for safety reasons we cannot do something like heating alcohol (ethanol, acetone, etc.) at a high temp because of the flammability of the liquid. We really need some help and advice so we can complete the lab tomorrow!

This is from a post lab question. The lab was really easy. Basically we were graphing the relation of the density (y axis) of salt water and the concentration of salt in water (x axis) As you can imagine our graph looks like a relatively straight slope with it's intercept at 1 g/ml In one part of the test we had to weigh the beaker + water + salt combination SPECIFICALLY before mixing and dissolving the salt. The post lab question essentially asks me why must we weight this combination before it becomes dissolved. I don't get that, the weight doesn't change, it's still the same. Would our graph be any different had we mixed it before weighi…

What property distinguishes shale from mudstone? Solubility Fissility Friability Alkalinity

The problem is as follows: The density of dry air at 1.00 atm and 34.4 degrees Celsius is 1.15g/L. Calculate the composition of air (percent by mass) assuming that it contains only nitrogen and oxygen and behaves like an ideal gas. (Hint: First calculate the "molar mass" of air, then the mole fractions, and then the mass fractions of O2 and N2.) This is my first time posting here so if I'm breaking any rules please let me know. I'm supposed to answer this problem with the information given and not assuming any values. The answer in the book is O2: 28% and N2: 72% I have been stuck on this problem for the past few hours and nothing I do seems to get me to the correct…

Hi guys, I need help with these problems. TYVM

I have no idea what to do with this problem.. Can anyone help me answer this please?

Please can someone explain to me what this question is asking for.. Explain the principles of estimating the rate of an enzyme catalysed reaction and the importance of measuring the initial rate of reaction..? Thanks

I am working on a project regarding selfish gene theory in relation to intelligence and thoughts in animals. Could someone simplify the selfish gene theory for me? I don't feel like I'm grasping the concept

Topic -Effects of competition during larval stages on adult life history traits using butterflies Hey everyone, Thank you for having me (newbie here ). I was hoping if any one could guide us or help us (by 'us' i mean that i'm working in a group) as our project is based on the above mentioned topic. We've formulated the null and alternative hypothesis as; null- there will be no effect of competition during larval stages on adult life history traits using butterflies alternative -there will be effect of competition during larval stages on adult life history traits using butterflies How can we design the experiments…