1.A cell's DNA molecules constructed ofA.amino acids.B.proteins.C.sugars, phosphates, and bases.D.all : 1777279
1.A cell's DNA molecules are constructed of
C.sugars, phosphates, and bases.
D.all of the above
E.none of the above
2.DNA molecules contain patterns for the production of
C.phosphates and sugars.
D.four kinds of bases.
E.all of the above
3.The first complex life appeared on Earth about 0.5 billion years ago during the
4.The Miller experiment created
5.____ is the molecule that carries information from the cell nucleus out into the cell where specific proteins are made from the information.
6.____ is the molecule in the cell nucleus that stores the information to make specific proteins out in the cell body.
7.Presuming that it takes several billion years of complex live to evolve in a stable environment, the stars most likely to currently have inhabited planets are
A.G to K main sequence stars.
B.B to A main sequence stars.
C.G to K giants.
D.white dwarf stars
8.The habitable zone is
A.the region on a planet where conditions are acceptable for life to exist.
B.a region around a star where a planet's temperature would permit the existence of liquid water.
C.very small for a massive star.
D.only found around G and K stars.
E.a region on a young planet where amino acids can begin to form DNA molecules.
9.All know forms of life on Earth use _______ as a medium for chemical reactions.
C.frozen carbon dioxide
10.The number of technological civilizations in our galaxy is limited by
A.the number of stars in our galaxy
B.the fraction of stars with planets
C.the number of planets per star in habitable zone longer than a few billion years
D.the fraction of suitable planet where technical life forms evolve.
E.All of the above.