If a viral gene prevents peptidoglycan units from being linked to lipid carriers, what will happen to the bacterial cell?
A. The cell wall will weaken, eventually leading to cell lysis.
B. Lipid metabolism will become impaired.
C. The cell wall with become stronger leading to virus to enter the lysogenic cycle.
D. The bacterial cell will start to take on the properties of a Gram Negative cell.
Answer: A
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Which of the following is true concerning the dodo bird?
a. The greatest effect by humans on the dodo bird was because Dutch sailors ate them b. The dodo bird went extinct in the twentieth century due to industrial pollution. c. Humans were not involved in their fate. d. Destruction of nests and habitat by animals that accompanied the sailors caused the greatest effect on dodo bird populations.
Put the major stages of development in order
What will be an ideal response?
Which of the following is a bacterium associated
with severe lung infection that requires a skin test or x-ray to identify? a. jock itch b. Bacillus subtilis c. Mycobacterium tuberculosis d. Staphylococcus epidermidis e. none of these
In the 2009 article "Genomic Footprints of a Cryptic Plastic Endosymbiosis in Diatoms" (Science 324: 1724-26), Moustafa et al. described their search for possible gene transfer from organelles to the nucleus in diatom genomes
They assumed that diatomic plastids came from red algae. However, they found that most were from green algae. Which is most likely? A) Diatoms once had green algal endosymbionts. B) Red algae had green algal endosymbionts. C) Red plastids were replaced by green plastids. D) Cyanobacteria imported green plastid genes. E) All red algal genes mutated to green algal genes.