Question

question 1 (4 points)
(01.03 lc)
which of the following was likely present in earths early atmosphere over four billion years ago?
o a abundance of oxygen
o b very cold temperatures
o c presence of inorganic molecules
o d low levels of ultraviolet radiation

question 2 (4 points)
(01.03 lc)
which major processes were needed for the origin of life on earth?
o a abundance of oxygen and the ozone layer
o b active volcanoes and very cold temperatures
o c low levels of ultraviolet radiation and specific mixture of gases
o d organic molecules produced from spontaneous synthesis or from meteorites

question 3 (4 points)
(01.03 mc)
how do the hypothesis of microspheres and the rna - world hypothesis build off of each other?
o a microspheres were important for storing and releasing energy for surrounding organisms that contained rna.
o b nonorganic molecules self - replicated within the early microspheres, similar to the way cells divide.
o c replicating rna molecules transformed into dna within the microspheres.
o d when microspheres split, the genetic coding in self - replicating rna would pass to the newly formed microspheres.

question 4 (4 points)
(01.03 mc)
the human gm - csf gene and the mouse gm - csf gene vary by more than 60% in their dna sequence. however, when scientists place the human gene into mice, it functions properly. what best explains why this happens?
o a the difference between gene sequences does not change the structure of the proteins.
o b the resulting proteins made by the human gene are similar to the proteins made by the mouse gene.
o c the mouse dna is a mutated form of the human gm - csf gene.
o d mice can make human protein without the use of the human gm - csf gene.

question 5 (4 points)
(01.03 mc)
organic molecules are sometimes found within meteorites that crash into earth. which meteorite condition in space is similar to what most likely was present in earths early atmosphere?
o a abundance of oxygen
o b very cold temperatures
o c presence of inorganic molecules
o d low levels of ultraviolet radiation

Explanation:

• Question 1: Early Earth's atmosphere had low oxygen, high - energy conditions like high UV radiation, and contained inorganic molecules. Inorganic molecules were present.
• Question 2: Organic molecules from spontaneous synthesis or meteorites were crucial for the origin of life.
• Question 3: When microspheres split, the genetic coding in self - replicating RNA would pass to the newly formed microspheres, linking the two hypotheses.
• Question 4: The resulting proteins made by the human gene are similar to the proteins made by the mouse gene, allowing the human gene to function in mice.
• Question 5: The presence of inorganic molecules in meteorites is similar to what was likely present in Earth's early atmosphere.

Answer:

• Question 1: c. Presence of inorganic molecules
• Question 2: d. Organic molecules produced from spontaneous synthesis or from meteorites
• Question 3: d. When microspheres split, the genetic coding in self - replicating RNA would pass to the newly formed microspheres.
• Question 4: b. The resulting proteins made by the human gene are similar to the proteins made by the mouse gene.
• Question 5: c. Presence of inorganic molecules