Which of the following requires an aditional intake of oxygen for a 20 to 30 minute period?

A. Aerobic exercise

B. Anaerobic exercise

C. Flexibilty exercisie

D. High endurance exercise

What kind of organism reaches equilibrium? A. one that is actively metabolizing B. one with a low metabolic rate C. a dead organism D. all living organisms are at equilibrium all of the time

What determines the carrying capacity of an ecosystem? a. the number of different types of organisms in an ecosystem b. the amount of available resources c. the square mileage it encompasses d. the ratio of biotic to abiotic factors

Which of these was NOT a period of the Mesozoic? Triassic Jurassic Cretaceous Quaternary

Suppose a mutation greatly increases the affinity of a rod's sodium channels for cGMP, such that once cGMP binds to a channel, it remains bound for much longer than normal. What would be the effect of this mutation on the rod's sodium channels?

Why do we need to use bacteria for gene cloning?

Most of cellular respiration take place in what

An ocean trench forms when?

The fact that a strain of yeast with a certain defective gene can use the human version of the gene to repair itself is evidence that yeast and humans

What is the difference between a meteor and a meteorite? A meteor has more mass A meteorite reaches Earth and has not burned up A meteorite orbits the sun and a meteor does not A meteorite glows

Which of these was NOT characteristic of the first cells on Earth? A) anaerobic B) prokaryotic C) single-celled D) contained organelles