Lecture 26A

Question 1

what is TB caused by

Answer 1

Mycobacterium

Question 2

what caused the reemergence of TB

Answer 2

HIV/AIDS

Question 3

how do antibiotics work

Answer 3

they kill bacteria and inhibit growth

Question 4

list the things antibiotics block

Answer 4

cell wall (can’t replicate)
cell membrane (can’t replicate)
protein synthesis (can’t survive)
folic acid(dna repli, repair, and transcrip)

Question 5

How can I bacterial cell be resistant to an antibiotic

Answer 5

destroy it
Pump it out
Prevent it from entering cell
Change shape of drugs target molecule

Question 6

How did mycobacterium tuberculosis become resistant to antibiotics?

Answer 6

1) a chance mutation occurs
2) drug therapy kills most bacteria without the mutation
3) mutant cells proliferate
4) drug therapy is ineffective against mutant cells

Question 7

how are humans changing the environment?

Answer 7

They’re causing unintended natural selection to occur

Question 8

directional selection changes

Answer 8

The average value of a trait in the population

Question 9

For discrete traits, one allele can become

Answer 9

fixed