What is the MOST important role that proteins play in living organisms on Earth?
A) basic functioning of living organisms
B) short-term energy storage
C) information storage
D) long-term energy storage and cell structure
A
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HII regions are found near stars cooler than 25,000 K because large amounts of ultraviolet photons would totally destroy the hydrogen atoms in the gas
Indicate whether the statement is true or false
The Moon orbits the Earth the Earth orbits the Sun. If the Earth-moon system is ˜1 AU from the Sun and takes ˜1 Earth year to orbit, what is the combined mass of the triple system? Express your answer in solar mass units
a. 1 b. 1.1 c. 1.2 d. 1.3
Two satellites with equal rest masses of 100 kg are traveling toward each other in deep space
They have identical speeds of 0.600c. The satellites collide and stick together. What is the rest mass of the combined object after the collision? A) 200 kg B) 225 kg C) 250 kg D) 275 kg E) 300 kg
Strontium, Sr (number 38), is especially dangerous to humans because it tends to accumulate in calcium-dependent bone marrow tissues (calcium, Ca, number 20)
This fact relates to the organization of the periodic table in that strontium and calcium are both A) metals. B) in group 2 of the periodic table. C) made of relatively large atoms. D) soluble in water.