Oct 30 Flashcards Preview

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Flashcards in Oct 30 Deck (20):
1

TRUE/FALSE
Protein function does not constrain/limit accumulation of mutations in virulence factors

FALSE

2

Which pathogen evolution hypothesis best describes the following: virulence is not directly
selected for but is a by-product of selection on other traits
a) coincidental
b) short-sighted
c) trade-off

a) coincidental

3

The low frequency of Hamiltonella in nonparasitized aphid populations suggests
a) reduced fitness
b) elevated fitness
c) obligate mutualism

a) reduced fitness

4

How does Hamiltonella protect host?

lysogenic phage present in Hamiltonella encodes insect toxins

5

Hamiltonella experiences
a) horizontal gene transfer
b) vertical gene transfer
c) both

c) both

6

Aphid symbiont Buchnera experiences
a) horizontal gene transfer
b) vertical gene transfer
c) both

b) vertical gene transfer-->limited gene flow!

7

Each generation of aphid symbionts experiences...

bottleneck

8

Buchnera is what type of symbiont?

obligate mutualist

9

TRUE/FALSE
Buchnera and aphids exhibit cocladogenesis and cospeciation

TRUE

10

Which have larger genomes, facultative or obligate symbionts?

facultative

11

Unidirectional genome reduction is found in what type of endosymbionts?

obligate

12

Genome reduction in obligate endosymbiotic bacteria is (irreversible/reversible)?

irreversible

13

What is a sexual outcome of obligate endosymbiotic bacteria?

asexuality

14

TRUE/FALSE
Most hosts feed on nutritionally imbalanced diets

TRUE

15

Does Buchnera synthesize amino acids?

YES

16

What type of tissue do endosymbionts occupy?

closely associated

17

What is unique about the transmission of Sulcia?

maternally-inherited

18

How does Sulcia complement cicada diet?

provides proteins

19

What is a reason for the loss of secondary endosymbiont?

acquisition of too many mutations

20

What is the system of multiple symbiosis in mealbugs?

Tremblaya (bac) harbors Moranella (bac) that collaborate to make Trp and Phe with help from the host (insect)