Exam 1 study guide

Question 1

what are Koch’s 4 postulate to help identify the cause of disease

Answer 1

1. the organism must always be present in every case of the disease
2. the organism must be isolated from a host containing the disease and grown in a pure culture
3. samples of the organism taken from the pure culture must cause the same disease inoculated into a healthy animal in the lab
4. the organism must be isolated from the inoculated animal and must be identified as the same original organism that was first isolated from the originally diseased host.

Question 2

what is the germ theory of disease

Answer 2

many diseases are caused by microorganisms such as bacteria, viruses, protozoa, or fungi.

Question 3

What was the purpose of the goose neck flask experiment?

Answer 3

demonstrated that certain germ particles in the air caused the spoiling of the broth, disproving spontaneous generation

Question 4

what does the 16SrRNA do?

Answer 4

16s rRNA is present in prokaryotes
- encodes the small subunit ribosomal RNA molecules of ribosomes

Question 5

what does the 18SrRNA do?

Answer 5

18s rRNA is present in eukaryotes
- encodes for 40s subunit of the eukaryotic ribosome

Question 6

80S cytoplasmic ribosomes are present in what kind of cell ribosomes

Answer 6

Eukaryotic ribosomes

Question 7

Do mitochondria have 80S or 70S ribosomes?

Answer 7

The ribosome of bacteria, mitochondria, and chloroplasts have a 70S type of ribosome. They all have their own nucleic acid.