Friday
April 24, 2015

Posts by Lucy


Total # Posts: 789

physics
help pls. i need to find the best animation of the movement of electrons and protons... the best one... pls send me the link. thanks so much.
April 24, 2015

Calculus
how can you find the bounderies given by the curve x=4sqrt(y) and y=4sqrt(x)? show your solution please. thanks to anyone who will notice this!
March 30, 2015

genetics
Wild type, or wt, refers to the genotype that is the typical genotype found in nature. True False
March 22, 2015

genetics
Auxotrophs are organisms that can grow: A.on minimal media. B.only with sunlight. C.only on amino acid supplemented media. D.only on vitamin supplemented media. E.on any media.
March 22, 2015

genetics
Though this question sucks, which enzyme elongates the new DNA strand starting at an RNA primer? A.DNA polymerase I B.DNA polymerase III C.DNA polymerase II D.DNA ligase E.RNA polymerase
March 22, 2015

genetics
The two most basic steps of DNA replication are: A.primase causes primer to bind the template and ligase copies the template. B.helicase unwinds the template and DNA polymerase binds the template. C.leading strand is copied first and lagging strand is copied second. D.the new ...
March 22, 2015

genetics
What is a replication bubble? A.A complex of replication enzymes on the DNA template strand B.A DNA sequence that initiates replication C.A tangle of denatured DNA strands near the replication fork D.A locally denatured segment of DNA where replication originates E.A localized...
March 22, 2015

genetics
In E. coli, replication begins at which chromosome site? A.The replication fork B.Hfr C.oriC D.TATA box E.Pribnow box
March 22, 2015

genetics
The definition of transformation is: A.the shift of genetic information from DNA to protein. B.the recombination of DNA strands during meiosis C.the uptake of genetic information by a cell from the environment. D.the combining of DNA during fertilization. E.the changes caused ...
March 22, 2015

genetics
Antiparallel means that: A.the two polynucleotide chains run in opposite directions. B.each DNA molecule consists of one old and one new strand. C.opposite strands are held together by base pairing. D.the helix twists to the right. E.there is complementary base-pairing
March 22, 2015

genetics
complimentary base pairing allows for: A. spontaneous mutations to occur B. genes to be expressed as a phenotype C. DNA to serve as its own template for replication D. covalent bonds to form between the opposite bases E. The equalization of the purine and pyrimidine content of...
March 22, 2015

genetics
Which of the following are the purine nucleotides in DNA? A.Adenine and thymine B.Cytosine and guanine C.Adenine and cytosine D.Guanine and adenine E.Thymine and uracil
March 22, 2015

genetics
I PCR out a mutated gene in a patient with Lisenbee chorea (the inability to dance in a coordinated fashion) and I compare it to another patient with that same disease phenotype. One subject had a mutation on chromosome 4, and the other subject couldn't rock it because of...
March 22, 2015

genetics
With PCR, one gene is all that is necessary to create a useful genetic fingerprint to discriminate between individuals. True False
March 22, 2015

genetics
DNA markers, or variant non-coding regions of DNA, are DNA polymorphisms that are useful for genetic mapping. True False
March 22, 2015

genetics
DNA is often purified by DNA electrophoresis, like in old-school DNA sequencing. In DNA electrophoresis, fragment separation is based on _____. (Best answer) A.fragment charge. B.fragment size. C.fragment sequence. D.fragment G-C content. E. fragment A-T content.
March 22, 2015

genetics
Which of the following does not occur during the PCR reactions? A.Changes in the reaction temperature by a thermocycler B.Denaturation at high temperatures C.Synthesis of oligonucleotide primers D.Extension of primers by DNA polymerase E.Annealing of oligonucleotide primers
March 22, 2015

Genetics
Question 12 An Hfr strain with the genotype cys+ leu+ met+ strS is mated with an F- strain carrying the genotype cys- leu -met- strR . In an interrupted mating experiment, small samples of the conjugating bacteria are withdrawn every 3 minutes for 30 minutes. The withdrawn ...
March 22, 2015

genetics
kernel phenotype Number colored, shrunken, starchy 116 colored, full, starchy 601 colored, full, waxy 2538 colored, shrunken, waxy 4 colorless, shrunken, starchy 2708 colorless, full, starchy 2 colorless, full, waxy 113 colorless, shrunken, waxy 626 total 6708 Researchers ...
March 22, 2015

Genetics
The boss in your laboratory has just heard of a proposal by another laboratory that genes for eye color and the length of body bristles may be linked in Drosophila. Your lab has numerous pure-breeding stocks of Drosophila that could be used to verify or refute genetic linkage...
March 22, 2015

genetics
In tomatoes, the allele T for tall plant height is dominant to dwarf allele t, the P allele for smooth is dominant to the p allele for peach fuzz skin, and the allele R for round fruit dominant to the recessive r allele for oblong fruit. The genes controlling these traits are ...
March 22, 2015

Chemistry
How much time is required for a sound to travel 1 mile if the air temperature is: 0.0 Degrees Celsius 20.0 Degrees Celsius 40.0 Degrees Celsius 80.0 Degrees Celsius
March 12, 2015

Chrmistry
How many grams of hydrogen gas be produced from the reaction of 3 g of magnesium with 4 g of hydrochloric acid. identify the limiting in excess reactants. Please help btw that's the exact question.
March 8, 2015

Science
What will the sound of speed be in air if temp is 10 degrees Celsius.this is crickets looking for e plantation on equation
March 4, 2015

Algebra 2
The length of a rectangular window is 5 feet more than its width, w. The area of the window is 36 square feet. Write an equation to represent the area of the window. Please have your final equation equal to zero.
February 20, 2015

statistics
I am trying to figure out how the answer of 0.989 came from the following equation of correlation. 7(-5)-(25)(13) _______________________ /7(127)-(25)*/x/7(71)-(13)*
January 23, 2015

Calculus
Evaluate each telescoping sum: 1) Sum from i = 1 to 100 of (5^i - 5^(i-1)). I know that I could apply the (n(n+1))/2 summation rule to the 5^i part of the question and then plug in 100, but I am unsure what to do for the second half --> -5^(i-1)! Thank you for any help!
January 9, 2015

Chemistry
Thank you very much!!!
January 6, 2015

Chemistry
100lbs x453.6g/lbs = 45360grams 45360 grams x 1mol/18.02 g= 2517.2 moles 2517.2mol x 6.01kj/mol = 15128.4kj 45360 grams x 4.18j/g C x 100C x 1/1000 = 18960.5 45360g x 1 mol/ 18.02g x 40.6 kj/ mol = 102198kj All added equals 136287 kj 2.54E4 J /1g x #g = 136287 kj #g= 5.36 kj
January 6, 2015

Chemistry
How do I send a picture of my work here?
January 6, 2015

Chemistry
The heat of combustion of bituminous coal is 2.5 x 10^4 J/g. What quantity of coal is required to produce the energy required to convert 100. Pounds of ice at 0.0 degrees Celsius to steam at 100.0 degrees Celsius? Is the answer 5.36 about right. I'm not sure if I did it ...
January 6, 2015

Physics
An object has a volume of 4.0m^3 and weighs 40,000 Newtons. What will be its weight in water?
January 6, 2015

physics
The small piston of a hydraulic lift has a diameter of 8 cm and its large piston has a diameter of 40cm. The lift raises a load of 15,000 Newtons. A. Determine the force that must be applied to the small piston. B. Determine the pressure applied to the fluid in the lift.
January 6, 2015

Chemistry
Does an answer around 5.36563 kg sound about right? After adding q1+q2+q3 I got 136287 kj so I converted that to J and then found the #g coal to be 5.36563 kg.
January 5, 2015

Chemistry
The heat of combustion of bituminous coal is 2.5 x 10^4 J/g. What quantity of coal is required to produce the energy required to convert 100. Pounds of ice at 0.0 degrees Celsius to steam at 100.0 degrees Celsius?
January 5, 2015

physics
all i was need a formula
January 4, 2015

physics
a pendulum 3m long is displaced at an angle of 40 degrees. What will be the maximum velocity of the pendulum when it is released to oscillate?
January 4, 2015

physics
a car rolls down a ramp 4m long that has angle of incline equal to 37 degrees. If the car starts from rest, what will be its velocity at the bottom of the ramp?
January 4, 2015

physics
e. J-s
January 4, 2015

Chemistry
Are there any structural isomers of hydrocarbons from methane to decane have 3 stereogenic C atoms? (i know that there are none for decane itself, but I am wondering about the others before it.) Thanks in advance!
December 13, 2014

Physics
A roller coaster goes 40-m along a section of track sloping 10 degrees below the horizontal, followed by a 13-m section sloping upward at 6 degrees, followed by an 26-m section of level track. Find the net displacement in m.
December 7, 2014

Calculus
A sherman is in a rowboat on a lake and 3 km from shore. He wishes to reach a store 2 km down the (straight) shore. He can row at 5 km/h and run at 13 km/h. To what point down-shore should he row to get to the store as quickly as possible? 8. The cross-section of a tunnel
December 3, 2014

Calculus
For f(x)= (x+3)^2/(4x-5) find all x such that f(x) increases.
November 22, 2014

CIS
or nah
November 21, 2014

Calculus - PLEASE HELP!!
For any real number x there is a unique integer n such that n≤x<n+1, and the greatest integer function is defined as ⌊x⌋=n. Where are the critical values of the greatest integer function? Which are local maxima and which are local minima?
November 17, 2014

Physics
You have a tanker that is filled with olive oil, which total mass = 200 kg. The tanker is in the shape of a rectangular box w/vertical sides and a horizontal cross-sectional area 0.9 m^2. How deep a swimming pool do you need so that the tanker doesn't hit the bottom?
November 16, 2014

geometry
find the perimeter and area of each figure. Give your answers in simplest radical form. 1. a 30 degree-60 degree-90 degree triangle with hypotenuse length 28 centimeters
November 10, 2014

math
well a tree diagram would work better
November 8, 2014

chemsitry
How many moles of silver chromate will be produced from 146 g of silver nitrate?
November 3, 2014

Science
thank you
October 28, 2014

Science
is it one parent?
October 28, 2014

Science
Where does a clone recieve is DNA from? My guess is two parents
October 28, 2014

Math
A tree is losing its trees. Two thirds fall off in the first week, two thirds of those remaining fall off in the second week, and two thirds off those remaining fall off in the third week. Now there are 37 leaves. How many leaves did the tree have originally?
October 25, 2014

Calculus
Find an equation of the tangent line to the curve f(x) = (sins)^2 + 2tanx at x= pi/4. I worked through it and got y = 5x + 5/2 for my answer, but the answer key says that it is y - 5/2 = 5(x - pi/4). Why is the pi/4 in the answer? Thanks for any help!
October 19, 2014

Physics
A projectile is accelerated from rest at point A along a circular track of radius 2 m, as shown in Fig. 5.1. Gravity acts in the z direction. The rate at which the speed of the projectile increases as a function of time, t, is at = 2t ms-2. What is the magnitude of the ...
October 16, 2014

statistics
A box contains 19 red marbles and 19 green marbles. Sampling at random from the box five times with replacement, you have drawn a red marble all five times. What is the probability of drawing a red marble the sixth time?
October 12, 2014

Physics 30
inquiry lab determining the refractive index of a variety of materials (Snell's Law Lab): Basically this lab: We us a polar coordinate paper and a semicircular shaped containers which we switch between, which are composed of different material. We shine a narrow light ...
October 11, 2014

Math
A spherical balloon is to be deflated so that its radius decreases at a constant rate of 12 cm/min. At what rate must air be removed when the radius is 5 cm? Must be accurate to the 5th decimal place. I keep getting -3769.91118. What am I doing wrong? Please help!
October 5, 2014

Chemistry
How do I solve these problems You have 2000. g of aqueous NaOH solution. The percent by mass of the solute is 4.25%. How many grams of NaOH are in the solution? If you have 100.0 mL of a 25.0% aqueous solution of ethanol, what volumes of ethanol and water are in the solution?
October 4, 2014

real analysis
I mean prove the supremum of the set {2-1/n: n in N} is 2
September 30, 2014

real analysis
Hello. I want make sure im doing right step. Prove the supremum of the set A={2-1/n: n in natural number} is 3. My answer Proof: lets prove supA=2 Then 2 is an upper bound of A. Let S'<2, then S' is not upper bound. There exists x in A such that x> S' Then 0...
September 30, 2014

algebra
the cinema sold 600 tickets total. adults tickets were $15 and childrens tickets were $8. they made a total of $7740. how much of each ticket were sold?
September 23, 2014

real analysis
i noticed it doesn't have x in them. i dont know what to do. prove: let epsilon>0. let f(x) = pi + 3 for x∈ real number. Prove your conjecture. Whether f is continuous for all r ∈ real number. my proof; |f(x)-f(r)|=|(pi+3)-(pi+3)|<epsilon so 0<epsilon ...
September 20, 2014

real analysis
thanks @MathMate
September 14, 2014

real analysis
definiton: A set S subsect of real number, sequence {Xn} is called bounded if there is a number M such that |X|≤ M for all x ∈ S prove the sequence (-8+(n/(n+1))) is bounded. my anwser proof: Let Xn = (-8+(n/(n+1))) there exist M in real number such that |Xn| &#...
September 14, 2014

math
Show that if a radioactive substance has a half life of T, then the corresponding constant k in the exponential decay function is given by k=-ln(2)/T I'm confused about how to show that that is true.
September 4, 2014

ethics
IS IT C?
September 1, 2014

math
how many minutes from 11:35 am till 12:50 pm?
May 31, 2014

Math
Find the quadratic polynomial whose graph goes through the points (-2,5), (0,5), and (1,11). f(x)= ______x^2+ ______x+ _______
May 4, 2014

music
ur vt9hg5gv
May 1, 2014

calc
If y^3 = 16x^2 Determine dx/dt When x= 4 and dy/dt= -1
April 21, 2014

Calc
A particle is moving along the curve y= 4 sqrt{2 x + 2}. As the particle passes through the point (1, 8), its x-coordinate increases at a rate of 5 units per second. Find the rate of change of the distance from the particle to the origin at this instant.
April 21, 2014

physics
Imagine having an 80-turn coil with radius of 5.0 cm and resistance of 30 Ù. At what rate must a perpendicular magnetic field change to produce a current of 4.0 A?
March 30, 2014

physics
A uniform magnetic field makes an angle of 30 degrees with the axis of a circular loop of 300 turns and radius of 4 cm. The magnetic field changes at a rate of 85 T/s. Determine the magnitude of the induced emf in the loop.
March 30, 2014

Math
1. Subtract k to both sides 6k - 8 - k = k - 2 -k 5k - 8 = 2 (Remember that k is basically 1k) 2. Add 8 to both sides 5k - 8 + 8 = 2 + 8 5k = 10 3. Divide 5 to both sides 5k/5 = 10/5 k = 2
March 19, 2014

math
2/5 are women There are 132 women Find the total 2/5 = 132/x 2x = 132*5 2x = 660 x = 330 Find how many men there are 1/4 = x/330 4x = 330 x = 82.5 There are about 83 men 132 + 83 + x = 330 x = 115 There are about 115 children at the circus show.
March 19, 2014

Chemistry
What is the concentration of hydronium ions in a solution that is 0.12 M HBrO(aq) and 0.160 M NaBrO(aq)?
March 19, 2014

Math
4 + 3p = 19 Subtract both sides by 4 4 - 4 + 3p = 19 - 4 You'll get 0 + 3p = 15 3p = 15 Divide both sides by 3 3p/3 = 15/3 You'll get p = 5 Hope this helps
March 19, 2014

math
Jack has 2009 unit cubes glued together to form a cuboid. He opens a packet containing 2009 stickers. He has enough stickers to stick one on each cube. How many stickers does he have left?
March 16, 2014

physics
A 6.0 Ù resistor and a 3.0 Ù resistor are connected in parallel to a 1.5 V battery of negligible internal resistance. What is the current in the 3.0 Ù resistor?
March 6, 2014

physics
A potential difference of 2.0 V is applied across a wire of cross sectional area 2.5 mm2. The current which passes through the wire is 3.2 × 10-3 A. What is the resistance of the wire?
March 6, 2014

physics
At a critical junction in a supercomputer, the current as a function of time is given as i(t) = 3t^2-2t, where i is measured in milliamps and t is measured in seconds. How much charge passes through this critical junction during the interval 0 < t < 5.00 s?
March 6, 2014

English
Is it "watch a one of a kind performance" or "watch one of a kind performance" I thought it was the first one, while someone else thought the second. Thanks!
February 25, 2014

Geometry
ABCD is a parallelogram. P is a point on AB such that AP:AB = 1:4. Q is a point on CD such that DQ:DC = 1:3. AQ and DP intersect at R. Find the ratio AR:RQ and the ratio AR:AQ. Show work.
February 21, 2014

Maths
A true/ false test is given. If a person guesses the answers, the probability that any particular question is correctly answered is 0.5. If the test contains 14 questions and 7 correct answers is a pass, what is the probability of passing the test by simply guessing?
February 13, 2014

Math
Thank You Ms. Sue. Have a Good Night
February 11, 2014

Math
Mary and Bob sold candy. Mary sold 4/5 as much candy as Bob did. If Mary sold 1/2 box how many boxes did Bob sell? I did 4/5 divided by 1/2 and was told this was wrong???? Can someone tell me what I did wrong? Thanks You
February 11, 2014

math
The profit in dollars in producing x- items of some commodity is given by the equation P = - 40 x^2 + 1000 x - 5250 . How many items should be produced to maximize the profit? What is the maximum profit?
February 9, 2014

math
the scale on a map is 1:2500, a pond on a map has a perimeter of 12cm, how far have you actually walked
January 10, 2014

Physics-forces
A woman wearing high-heeled shoes stands on a wooden floor. Her total weight is 480N and acts equally on each foot. Sometimes all this weight acts on the heels of her shoes. What is the pressure under her heels? 240n/2cm^2
January 6, 2014

Physics-forces
240n/2cm^2 240n/40cm^2 A woman wearing high-heeled shoes stands on a wooden floor. Her total weight is 480N and acts equally on each foot. Why are marks left on the wooden floor by the woman's shoe heels but not her shoe soles? really need help with these questions
January 6, 2014

physics
240n/2cm^2 240n/40 cm^2
January 6, 2014

physics
A woman wearing high-heeled shoes stands on a wooden floor. Her total weight is 480N and acts equally on each foot. Why are marks left on the wooden floor by the woman's shoe heels but not her shoe soles?
January 6, 2014

Algebra 1
Thanks but my teacher said that the answer is y= 2x - 9
November 3, 2013

Algebra 1
Find the y-intercept of the two coordinates ( 2, -5) and ( 6, 3). Please help me with this question and please explain to me and show me how to find Each step to solving the y- intercept. Thank you 😄
November 3, 2013

calculus
(A) Consider the wave equation with c=1, l=1, u(0,t)=0, and u(l,t)=0. The initial data are: f(x)=x(1-x)2, g(x)=sin2(pi x). Find the value of the solution at x=0, t=10, and at x=1/3, t=0. Find the value of the solution at x=1/2, t=2. (B) Suppose that l=2, c=1/2. Draw the domain...
October 22, 2013

science
if 8.100 grams of C6H6 is burned and heat is produced from the burning is added to 5691 grams of water at 21 degrees celsius what is the final temp of the water? 2C6H6+15O2=12CO2+6H2O+6524kj
October 17, 2013

physics
Gnhdjkkvfu
October 13, 2013

math
a
September 28, 2013

Math
Find two numbers the exact same answer is between 6×7,381
September 24, 2013

  1. Pages:
  2. 1
  3. 2
  4. 3
  5. 4
  6. 5
  7. 6
  8. 7
  9. 8
  10. Next>>

Members