1. Bacteria, Archaea, & Protists
Bio 94 Week 4 Discussion
Bacteria, Archaea, & Protists

2. 17, 11

3. 15.
Genetic drift occurs in a population. Which of the following statements might be true?
A. Genetic drift increased the population's fitness.
B. The population experiences a decrease in genetic variation.
C. Genetic drift decreased the population's fitness.
D. Any of the statements might be true

4. 14. Why doesn't inbreeding, by itself, cause evolution?
A. It increases homozygosity.
B. It violates the Hardy-Weinberg assumptions.
C. It does not change the population's allele frequencies.
D. It decreases the population's average fitness

5. What is an important consequence of gene flow in natural populations?
A. Gene flow increases the mutation rate among sedentary organisms.
B. Gene flow moves individuals from one habitat to another on a seasonal basis.
C. Gene flow tends to separate allele frequencies among populations.
D. Gene flow tends to reduce genetic differences among populations.

6. The two key factors responsible for allopatric speciation are
A. lack of gene flow and mutation
B. mutation and genetic drift.
C. genetic isolation and genetic divergence.
D. postzygotic isolation and morphological change

7. Although each of the following has a better chance of influencing gene frequencies in small populations than in large populations, which one most consistently requires a small population as a precondition for its occurrence?
A. mutation
B. natural
selection
C. genetic drift
D. nonrandom mating

8. Why are bacteria/archaea interesting?

9. What was the common ancestor of all species living today, prokaryotic or eukaryotic?

10. Extremophiles
Bacteria or archaea that live in high-salt, high-temperature, low-temperature, or high-pressure habitats. Hot area of research for understanding the tree of life, exploring the structure and function of enzymes.

11. Microbiome
Discuss human microbiome (more bacteria cells than human cells) & metagenomics

12. Morphological Diversity
Size
Shape
Motility
Shows different sizes and shapes of bacteria (smallest 0.3 μm, largest 100 μm, Spirals, Swimming, Gliding)

13. Cell-Wall Composition

14. Worksheet

15. Metabolic Diversity Phototrophs: from sunlight
Chemotrophs: from chemicals
Chemoorganotrophs: organic molecules
Chemolithotrophs: inorganic molecules
Autotrophs: self-synthesized from simple molecules
Heterotrophs: from molecules produced by other organisms

16. Protists
Very common in oceans
Euglenoid

17. Protists are paraphyletic

18. Origin of nuclear envelope, mitochondrion, and chloroplast

19. Worksheet

20. Haploid life cycle

21. Diploid Life Cycle

22. Alternation of generations
Multicellular haploid and diploid forms can look identical or different