Deoxyribonucleic acid (DNA) automatically combines raw materials to form important chemical compounds. The building blocks of these molecules are _____
A) sugars
B) amino acids
C) lipids
D) vitamins
B
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When a laboratory sample of unknown mass is placed on a vertical spring-scale having a force constant (spring constant) of 467 N/m, the system obeys the equation y = (4.4 cm) cos(33.3 s-1 t). What is the mass of this laboratory sample?
What will be an ideal response?
Weight and g: At a given point above Earth's surface, the acceleration due to gravity is equal to 7.8 m/s2. What is the altitude of this point above Earth's surface? (G = 6.67 × 10-11 N ? m2/kg2, Mearth = 5.97 × 1024 kg, Rearth = 6.38 × 106 m)
A. 770 km B. 970 km C. 1500 km D. 2000 km E. 2400 km
What temperature exists inside a solar collector (effective collection area of 15 m2 ) on a bright sunny day when the outside temperature is +20.°C?
Assume that the collector is thermally insulated, that the sun irradiates the collector with a power per unit area of 600 W/m2, and that the collector acts as a perfect black body. A) 107°C B) 154°C C) 93°C D) 73°C E) 33°C
Light entering a transparent material from the air:
a. bends toward the normal. b. bends away from the normal. c. bends toward its source. d. does not bend. e. is entirely reflected.