The "bottom-up" approach to creating artificial life starts
A) with simple bacteria and attempts to add DNA sequences to them to make them more complex
B) with advanced robots and attempts to make them able to reproduce
C) in the laboratory with the raw ingredients of life, and seeks to reproduce life in much the same way that it presumably originated billions of years ago
D) with existing organisms and genetically strips them down, then tries to rebuild them into new species
C
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The figure shows the position of an object as a function of time, with all numbers accurate to two significant figures. Between time and time (a) what is the average speed of the object? (b) what is the average velocity of the object?
What will be an ideal response?
In pair production in the Big Bang, which statement is FALSE?
A) The heaviest particles and their antiparticles formed first, from collisions of the highest energy gamma rays. B) Matter is frozen energy, according to Einstein's E = mc2. C) Every electron should have a proton formed at the same time with it. D) Even neutrons have their antineutrons, although both lack any charge. E) In addition to familiar neutrons and protons, many other exotic particle and antiparticle pairs formed, but decayed back to radiation.
The specific heat capacity of water is about twice the specific heat capacity of ice. From this information, the amount of heat required to boil 1 kg of water is ________ the amount of heat required to melt 1 kg of ice
a. 1/2 b. equal to c. 2 times d. unrelated to
A concave mirror has a focal length of 20 cm. What is the magnification if the object's distance is 100 cm?
a. 1/2 b. 1/4 c. ?2 d. 4 e. ?1/4