Complex molecules in the interstellar medium are found:
A) uniformly throughout the disk of the Galaxy.
B) scattered evenly throughout the universe, a product of the Big Bang itself.
C) only around the supergiant stars like Betelguese that make their heavy atoms.
D) primarily in the dense dust clouds.
E) on the surfaces of the coolest class K and M stars only.
Question 2
Various observations suggest there may be recent or even continuing volcanic activity on Venus. Which of the following has NOT been observed?
A) bursts of radio energy, similar to those produced by lightning discharges occurring in the plumes of erupting volcanoes on Earth
B) spacecraft detection over a period of days of flowing lava on Venus
C) fluctuations in the level of sulfur dioxide in the planet's atmosphere
D) surface features resembling rift valleys on Earth
E) larger shield volcanoes than Hawaii
Photograph of the retina of the eye. The optic disk appears yellow and the retinal arteries radiate
Lemurs are found only in Madagascar.
Oil molecules cling to metal surfaces but easily slide against each other.
Crystal structures of SecY complex in “closed” and “open” conformations
The path of the conveyor is complex and affected by deep ocean topography
A color-enhanced electron micrograph of circular plasmid molecules