Amphibians are thought to have evolved from
A. spiny fish.
B. lobe-finned fish.
C. ray-finned fish.
D. skates and rays.
E. annelids.
Answer: B
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J. A. Milburn and R. P. C. Johnson developed an acoustic method for detecting cavitation in plants. This involves "listening" for characteristic clicks produced during air-bubble formation, using sensitive microphones and amplifiers
In one experiment with the castor bean plant (Ricinus communis), they detached leaves by cutting the petioles and subjected them to various treatments. Which of the following would be LEAST likely to be observed in such an experiment? A) as the leaf is allowed to wilt, recording many clicks that approximately equal the estimated number of vessel elements in the cut petiole B) after increasing transpiration by blowing warm air across the leaf, recording an increased rate of clicking C) after adding water to the cut end of the petiole, recording an increased rate of clicking
Which of the following choices is not an example of genetic engineering? a. A gene from one species is introduced into another species
b. A deliberate change is made in the sequence of a gene in an individual's genome. c. Seeds from drought-resistant corn plants are propagated, creating a new drought-resistant strain. d. Bacteria are induced to produce human insulin
The source of sulfur for Hydrogen-Sulfide-producing bacteria in the Triple Sugar Iron Agar is
A. Sodium thiosulfate B. Ferrous sulfate C. Sodium sulfide D. Ferric citrate E. Sodium sulfate
The presence of a buffer in our blood helps maintain homeostasis.
Answer the following statement true (T) or false (F)