Questions asked by Sara

• Back to user's profile
• What are continuous and line spectrums?
  
• What are integrin #alpha# and #beta# in biology?
  
• What is the balanced chemical equation of Li(s) + H3PO4(aq) ?
  
• What is differential gene expression?
  
• What is a stem cell?
  
• Are all unicellular organisms haploid? If not, how do we know a cell is haploid or diploid?
  
• Why an egg is so much larger than a sperm cell?
  
• Would the image of an object be the same if we put it in front of a convex mirror, and in front of a diverging lens if they have the same focal length? If not, what would be the differences? (Distance of the object is the same in both conditions.)
  
• #z# is a complex number, #z=a+ib# and #(2+i)z=1-z#, what is #z# in terms of #i# ?
  
• #m# is a real number. #(x^2-mx+8) . (x-1) = 0# has two distinct roots. What are all #m# values?
  
• The parabola #f(x) = x^2 + 2(m+1)x + m + 3# is tangent to #x# axis in the negative side. What is the value of #m# ?
  
• If the parabolas given by #y=2x^2+6x+5# and #y=x^2+a# are tangent, what is the abscissa of the tangency point?
  
• Bob is falling down from a height. If he falls #x^2+5x# m in #x# seconds, how many seconds does it take him to fall #500# m?
  
• How are the terms gene, locus, and allele related?
  
• According to this reaction: #2Al+6HBr -> 2AlBr_3 + 3H_2# If 4 moles of #Al# react with 8 moles of #HBr#, how many moles of #H_2# are formed?
  
• #P(x)# is a polynomial function. If #P(x^2) = (a-b+2)x^3 - 2x^2 + (2a+b+7)x - 20# , what is #P(a+b)# ?
  
• If #(x-2).P(x)= 3x^3+ax-10# , what is #P(-1)# ?
  
• If one of the terms of the binomial expression #(x+y-3z)^n# is #A*x^3*y^4*z^2# , what is #n# ?
  
• If #-f(x) + f(x-1) = 3x# and #f(1)=1000#, what is #f(20)# ?
  
• If #f: R - {3} -> R - {4}# , and the function #f(x)=(mx+4)/(nx-9)# is one to one and onto, what is #f(1/3)# ?
  
• If #f(x)=mx-2# , #g(x)=(3x+2n)/6# and #(g@f)(x)# is a unit function, what is #m+n# ?
  
• In order for the function #f(x)=k(x-1)+x(k+3)+2# to be a constant function, what should be the value of #k# ?
  
• If #f(x) = 4^(x+1)# , what is #f(2x+3)# in terms of #f(x)# ?
  
• If the function #f(x) = (3x-c)/(ax+2)# is a constant function, what is the value of #a*c# ?
  
• What type of compounds cannot be detected using infrared spectroscopy and why?
  
• The #n#th term #u_n# of a geometric sequence is given by #u_n = 3(4)^(n+1)#, #n in ZZ^+#. What is the common ratio #r#?
  
• Solve the simultaneous equations #log_a(x+y) = 0# and #2log_ax = log(4y +1)# for #x# and #y# ?
  
• If #a# and #b# are unit vectors and #theta# is the angle between them, express #abs(a-b)# in terms of #theta# ?
  
• What is the electrode potential for #Pb^(2+)(aq) + 2e^(-) rightleftharpoons Pb(s)# when the concentration of #Pb^(2+) (aq)# is #0.05# #mol# #dm^(-3)# ?