Biology HRW Chapter 14

2. theory that says primitive eukaryotes engulfed smaller prokaryotic, unicellular organisms
5. Spallanzani boiled this and added to flasks to test the theory of spontaneous generation; 1765
9. (2 words) This is a method of determining the absolute age of an object by comparing the relative percentages of parent and daughter isotopes
10. Redi’s hypothesis was this
12. Layers of this type of rock were studied to give early estimates of Earth’s age
14. process by which archaea obtain energy
15. (2 words) Pasteur used this type of flask to answer objections to Spallanzani’s experiments; 1859
18. Redi used this to cover the jars that contained meat
21. (2 words) process in which unstable isotope nuclei release particles until the nuclei become stable again
22. (plural) RNA molecules that can act as catalysts and promote chemical reactions
23. (singular) all atoms of the same element have the same number of proteins, but differing neutrons

1. a group of photosynthetic, unicellular prokaryotes
3. single oxygen atoms react with oxygen gas to form this
4. (plural) Scientists believe the forming of the planets occurred during repeated _____
5. states that all living things come from other living things
6. (2 words) theory that believed living things could arise from nonliving things
7. (2 words) serves as a carbon source for the assembly of organic molecules in chemosynthesis
8. a related group of organisms that can thrive under harsh conditions
11. (2 words) Spallanzani designed an experiment to test the thought that microorganisms arose from this
13. (2 words) The total number of protons and neutrons in the nucleus of an atom
16. With Pasteur’s experiment, the principle of biogenesis became the _______ of biology
17. scientist who noticed and described the different developmental forms of flies; 1668
19. Isotopes are designated by their _____ symbol followed by their mass number
20. The length of time it takes for one-half of any sample size of an isotope to decay