Which one of the following objects is most like the planetesimals that formed in the solar nebula? ...

Which one of the following objects is most like the planetesimals that formed in the solar nebula?
 
  a. asteroids
  b. Earth
  c. Saturn
  d. Venus
  e. the sun

Question 2

____ is the molecule in the cell nucleus that stores the information to make specific proteins out in the cell body.
 
  a. An enzyme
  b. DNA
  c. RNA
  d. ALH84001
  e. PAH

Question 3

The planets all lie in nearly the same plane resulting in a disk-like structure for the solar system. This disk-like structure is believed to exist because
 
  a. the solar nebula from which the planets formed had a disk-like structure.
  b. the bipolar flow from the young sun cleared all material out of the nebula except that in the disk.
  c. Jupiter's gravity was great enough to pull all of the other planets to the plane of its orbit.
  d. the Milky Way Galaxy from which the planets condensed has a disk like structure

Question 4

____ is the molecule that carries information from the cell nucleus out into the cell where specific proteins are made from the information.
 
  a. An enzyme
  b. DNA
  c. RNA
  d. ALH84001
  e. PAH

Question 5

The terrestrial planets are thought to have formed by accreting solid planetesimals all with about the same composition. This means
 
  a. they were initially molten forming an iron core first, then they accreted a silicate crust later.
  b. they were initially molten forming a silicate core first, then they accreted an iron crust later.
  c. they were initially collections of solid particles which melted then differentiated into a high density iron metal core and low density silicate crust.
  d. they were initially collections of solid particles which melted then differentiated into a high density silicate core and low density iron metal crust.