11.Current searches for extraterrestrial intelligence use radio telescopes at wavelengths

Question : 11.Current searches for extraterrestrial intelligence use radio telescopes at wavelengths : 1777280

11.Current searches for extraterrestrial intelligence use radio telescopes at wavelengths
A.which must be shorter than the local wavelengths emitted by Earth’s atmosphere
B.which must be longer than the radio wavelength “noise” naturally emitted by our galaxy
C.Both conditions “a” and “b” above must be fulfilled.
D.Wrong! Visual light wavelengths are used because they are blocked by dust between the stars.

12.The DNA molecule can be altered
A.by chance mismatching of base pairs.
B.by damage from exposure to radioactivity.
C.if the host cell is intelligent and determines that an alteration would help the cell survive.
D.all of the above
E.a and b above

13.The most likely region of the radio spectrum for communication with other civilizations is the water hole, the part of the spectrum
A.near the radio emission of water.
B.near the radio emission of oxygen molecules.
C.between the radio emission of hydrogen and oxygen.
D.between the radio emissions of hydrogen and OH.
E.near the radio band where water in the Earth's atmosphere strongly absorbs energy.

14.The best places for life to have formed on Earth are believed to have been
A.near the south pole on the ice.
B.on the continent of Africa in the areas with no water.
C.in liquid water, probably in the oceans or pools of water.

15.An offspring born with altered DNA due to radioactivity, cosmic rays, or errors in reproduction
A.is called a mutant.
B.is called a new species.
C.is more likely to survive than if its DNA were not altered.
D.is no different than if its DNA were unchanged.
E.will never be able to reproduce itself.

16.Why are massive main sequence stars not likely to have planets that contain life?
A.The life zones around these stars is too small.
B.These stars would sweep away all of the material from which planets could form.
C.These stars are too hot to allow water to exist as a liquid on any planets that might form.
D.These stars are on the main sequence for too short a time to allow life to evolve.
E.These stars are almost always binaries and planetary orbits are unstable around binaries.

17.What limitation(s) make it impossible to travel between stars?


Fuel requirements


The tremendous distances between stars


The finite speed at which objects can travel

E.I, II, & III

18.DNA is important to a cell because
A.DNA is the cell membrane that allows nutrients to enter the cell and waste to leave.
B.DNA contains the information necessary to make all of the molecules required by the organism.
C.DNA contains the information necessary for the cell to reproduce itself.
D.all of the above
E.b and c above

19.ALH 84001
A.is a meteorite that shows evidence for life evolving on Mars.
B.is the compound used by Miller to begin his experiment to produce amino acids.
C.is the amino acid produced in the Miller experiment.
D.is the molecule that controls the reproduction of DNA within a cell
E.is the molecule that acts as DNAs messenger that assembles proteins from amino acids.

20.Why is it believed that life can not evolve on a planet that orbits a spectral type A, B or O star?
A.These stars produce too much infrared radiation which would destroy carbon-based organisms.
B.These stars have very small life zones.
C.These stars are not capable of producing planets.
D.These stars do not remain on the main sequence long enough for life to evolve.
E.These stars take too long to form.

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Astronomy 1 Year Ago 205 Views
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