Autopsies of defective embryos reveal that the neural ectode…

Autopsies of defective embryos reveal that the neural ectoderm fails to form, leading to embryos without central nervous systems. Explain the default model of ectodermal differentiation and how it is normally induced to become neural tissue. Which organizer-derived molecules might be missing, leading to this failure? If a synthetic signaling molecule had to be introduced to rescue neural induction, what would you propose?

Draw the Lewis structure of  PF5 on your exam work paper, wh…

Draw the Lewis structure of  PF5 on your exam work paper, which you will submit under Exam 5 work Apply VSEPR theory and answer each of the following questions on the exam: a) Total number of valence electrons. [a] valence electrons b) Number of lone pairs on central atom. [b] lone pairs c) Molecular Geometry. [c] shape d) Polar or Nonpolar. [d] molecule

A 75.5 gram sample of an unknown metal at 95.0oC is placed i…

A 75.5 gram sample of an unknown metal at 95.0oC is placed in 125 gram of water at 25.0oC. If the final temperature of the metal and water is 33.0oC, what is the specific heat capacity of the metal?  (the specific heat of water is 4.184 J/goC). Show all your work for full credit. Use the correct number of significant figures.

An unknown substance has a mass of 43.9 g. The temperature o…

An unknown substance has a mass of 43.9 g. The temperature of the substance increases from 27.1oC to 42.7oC when 89.1 J of heat is added to the substance. Substance Specific Heat (J/g·°C) Lead 0.130 Silver 0.240 Copper 0.385 Iron 0.442 Aluminum 0.892 Water 4.184   a) What is the specific heat of the unknown substance ? [a] J/goC b) Based on the substances shown on the table above, what is the most likely identity of the unknown substance ?[b]