Of the many possible nucleotides, the DNA used in living organisms on Earth uses how many?
A) 20
B) 4
C) 5
D) 23
B
Physics & Space Science
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Ideal Gas Law: An ideal gas has a pressure of 2.5 atm, a volume of 1.0 L at a temperature of 30°C. How many molecules are there in this gas? (R = 8.31 J/mol ? K,1.00 atm = 101 kPa, NA = 6.022 × 1023)
A. 6.1 × 1023 B. 6.0 × 1022 C. 2.4 × 1022 D. 2.3 × 1023
Physics & Space Science
When a sedimentary rock is melted and then re-solidifies it turns into
A) an igneous rock B) a meteorite C) a metamorphic rock D) another sedimentary rock
Physics & Space Science
Why does the Moon play a larger role in tides than the Sun?
What will be an ideal response?
Physics & Space Science
Sebastian has drawn a free-body diagram for a ladder of mass m leaning against a frictionless wall. His diagram is shown below. What is his error?
?
?
a.
is in the wrong direction.
b.
