Biology Quarter 3 Exam Flashcards
(18 cards)
Since the 1950s, experiments have been conducted that lead scientists to conclude that life many have originated __________.
In small pools of water where amino acids could be concentrated
The primitive earth atmosphere is hypothesized to have consisted mostly of ______________.
Hydrogen, methane, ammonia, and water vapor
Scientists agree that two developments must have occurred for life to come into being: the formation of simple organic molecules important to life and ______________.
Organization of molecules into complex organic molecules
Before biogenesis became an accepted cornerstone of biology, it was widely accepted that ___________.
Living things could arise spontaneously from other living things
Humans are thought to have evolved during the __________ Era.
Cenozoic
The geologic time scale begins at the formation of Earth approximately _______ years ago.
4.6 billion
Which of the following statements are true about fossils?
A) fossils are usually found in sediment
B) there are many different ways that fossils can be formed
C) fossil insects that were trapped in ice or hardened into amber
D) all of these
D) all of these
Which of the following fossils are not found in sedimentary rock? A) imprints B) frozen mammoths C) amber D) petrified wood
B) frozen mammoths
While looking for fossils on an eroded hillside, you discover fossil coral and fish in one layer. In a layer just above, you find the fossil imprint of a fern frond and some fossil moss. Assuming the rock has not been disturbed, which of the following is the most probable conclusion?
A sea had been replaced by land in ancient times
According to one theory, the first prokaryotes probably obtained their food by
Consuming organic molecules available in their environment
Which group of organisms is believed to have been the earliest to evolve
Cyanobacteria
Which fact is the basis for using the fossil record as evidence that evolution has taken place
In undisturbed layers of rock strata, the older fossils are found in the deeper layers
A clear fish imprint in a rock indicates that the rock is probably
Sedimentary
Urey and miller subjected water, ammonia, methane, and hydrogen to heating and cooling cycles and jolts of electricity in an attempt to
Form complex organic compounds
Which event contributed most directly to the evidence of aerobic organisms?
The presence of organisms able to carry on photosynthesis
According to figure 14-4, what was the earliest form of multicellular life on earth?
Invertebrates
According to figure 14-4, the correct chronological order of organisms as they develop are_____________.
Prokaryotes, jawed fish, dinosaurs, birds
According to figure 14-4, in how many eras have mammals existed?
2
