Why did Ackermann et al. (2003) use stalked species of bacteria with asymmetric division to study senes-cence in bacteria?
a. Because it had been previously shown that bacteria with symmetric division do no senesce.
b. Stalked bacteria are bigger and therefore easier to observe.
c. They were able to measure the age-specific fertility of a single cell.
d. It is the only way to measure the age-specific fertility of a single cell.
C
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You are studying swimming motility in a pathogenic bacillus. You create mutations in random genes and then test which mutations effect swimming motility by looking at the mutant cells under the microscope
One of the mutant bacteria can not swim anymore, but still rotates around in a one spot when you watch them. Using electron microscopy you discover that some parts of the flagella are still present in the cell wall, but no long flagella are visible. Which gene do you think is mutated (i.e., missing) and which motility-related parts are still present in this mutant? What will be an ideal response?
Only nine types of aneuploids are known in newborns because
A) only nine chromosomes undergo nondisjunction. B) most types of aneuploids are lethal early in development. C) most aneuploids do not cause detectable defects. D) most aneuploids do not affect the phenotype.
Cells can activate a genetic suicide program in response to a signal in the body. This programmed cell death is called ________
Fill in the blank(s) with correct word
Why do bacteria numbers start to decline when treated with antibiotic C but then begin to increase as time goes on?
A) Some bacteria with resistance to antibiotic C were selected for over time. B) Additional bacteria were added to the experimental group. C) Antibiotic C degraded and thus was no longer effective. D) This is the normal course of bacterial growth no matter which antibiotic is applied.