Biology 189 Lab Quiz 9 Questions with Answers

Biology 189 Lab Quiz 9 Questions with
Answers
Label a typical bacteria cell. - -

-What is circular DNA? - -DNA that forms a closed loop and therefore has no free ends that
is a complete closed DNA
ex: Plasmids

-How does bacteria multiply? - -Binary Fission

-What is the vertical gene transfer? - -When a bacterial cell goes through binary fission, it
is transferring its genes from the parent to the offspring.

-What is the horizontal gene transfer? - -One way bacteria can change their genome. This
can occur through transformation(occurs when a bacterial cell takes up DNA fragments
from the environment) and conjugation(occurs when a donor cell connects to a recipient
cell through a conjugation bridge)

-What is a plasmid? - -A small, circular piece of DNA

-What are the 3 shapes of bacteria? - -Coccus
Bacillus
Spirillum

-Describe Coccus - -*Spherical*

-Describe Bacillus - -Rod-like

-Describe Spirillum - -Helixes(spiral shaped)

-How can the shapes of bacteria grow? - -Grow in pairs(Diplococcus)
Grow in rows/chains(Streptococcus)
Grow in clusters, like grapes(Staphlococcus)

-In what ways can you identify bacteria? - -By their structure or colony

-How many bacteria need to be present to see a colony? - -30,000

-Which dye was used in this lab? - -Methylene blue

-How were the slides made in this lab? - -1. Place a small drop of water on a microscope
slide
2. Place inoculating loop inside the incinerator until it turns bright red.