Do trees really sequester carbon permanently or just while they are alive? What will be an ideal response?
While trees do not sequester carbon permanently, they do store it for longer than their lifespan. Much
of the carbon is trapped in slow to degrade forms such as cellulose and lignin. As a result, the release
of carbon from the decaying plant matter is exceedingly gradual.
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The work of Bartel's group on the ribozyme RNA replicase supports which conclusion?
A) An RNA world could produce molecules that could self-replicate. B) Natural selection requires human oversight. C) DNA must have come before RNA. D) Life cannot come from nonlife.
Enzymes are changed by the reaction as they raise the activation energy
Indicate whether this statement is true or false.
Australopithecus garhi lived about ________ million years ago.
A) 1.0 B) 2.5 C) 4.0 D) 5.0
Most bacterial cells keep from bursting in a hypotonic environment by:
a. an efficient water pump. b. a tough cell membrane. c. pumping large quantities of salts into the cell. d. a rigid cell wall. e. a stiff capsule.