1.10.1 History of Life: The Heterotroph Hypothesis: An Overview Flashcards
1
Q
theory
A
- a comprehensive explanation based on a broad set of observations. To qualify as a theory, the explanation must have overwhelming evidence that supports it.
2
Q
hypothesis
A
- a proposed explanation for an observation.
3
Q
heterotroph hypothesis
A
- attempts to explain how the first life on earth evolved.
4
Q
prokaryote
A
- a one-celled organism that lacks a nuclear membrane. There are two types of prokaryotes: bacteria and archaea.
5
Q
eukaryote
A
- an organism that has a nuclear membrane in its cell (or cells).
6
Q
stromalites
A
- oldest known life forms have been found
- domeshaped fossils of bacteria (prokaryotes) that
are between 3.5 and 4 billion years old.
7
Q
True or false?
Stromatolites are dome-shaped fossils of protists that are between 3.5 and 4 billion years old.
A
- false
8
Q
A hypothesis is
A
- a tentative explanation of observations
9
Q
Which of the following is not true about prokaryotes?
A
- they have a nuclear membrane
10
Q
An explanation with overwhelming evidence supporting it is known as a scientific
A
- theory
11
Q
Which statement concerning stromatolites is true?
A
- Stromatolites provide evidence that the earliest organisms on earth were prokaryotes.
12
Q
Regarding the cyanobacteria that form stromatolites, which of the following statements is false?
A
- They are the first eukaryotic organisms
