Lecture 10

Question 1

began on slide 29

Question 2

Is the top or bottom of the water more productive?

Answer 2

Top, there is more light and more oxygen

Question 3

Regions of oxygen-depleated waters at intermediate depths

Answer 3

Oxygen minimum zones (OMZs)`

Question 4

Prochlorococcus accounts for >40% of the ____ of marine phototrophs

Answer 4

biomass

Question 5

Prochlorococcus accounts for ~50% of the ______ _______ production

Answer 5

net primary

Question 6

When you get down to about _____, you lose light

Answer 6

1 km

Question 7

The most abundant marine heterotroph is _______, an oligotroph.

Answer 7

Pelagibacter

Question 8

an organism that grows best at very low nutrient concentrations

Answer 8

Oligotroph

Question 9

Pelagibacter and other marine heterotrophs contain __________, a form of rhodopsin that allows cells to use light energy to drive ATP synthesis.

Answer 9

proteorhodopsin

Question 10

Viruses are the _____ _______ microorganisms in
the oceans.

Answer 10

most abundant

Question 11

_____ of all ocean water is deep sea, lying primarily between 1000 and 6000 m.

Answer 11

> 75%

Question 12

Organisms that inhabit the deep sea must deal with

Answer 12

• low temp
• high pressure
• low nutrient levels

Question 13

What is pressure-loving?

Answer 13

piezophilic

Question 14

Cold-loving

Answer 14

psychrophilic

Question 15

Extreme piezophiles

Answer 15

Archae

Question 16

_______ bacteria predominate at hydrothermal vent.

Answer 16

Chemolithotrophic

Question 17

_____ and _____ are present at hydrothermal vents.

Answer 17

Thermophiles and hyperthermophiles