Which part of the lower respiratory tract integrates the respiratory system with the cardiovascular system?
A. sinus cavity
B. esophagus
C. bronchial tree
D. lungs
E. trachea
Answer: D
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Martinus Beijerinck was the first to isolate
A) green algae. B) certain nitrogen-fixing root nodule bacteria. C) certain sulfate-reducing bacteria. D) green algae, certain nitrogen-fixing root nodule bacteria, and certain sulfate-reducing bacteria.
The genomes of closely related species are more similar than distantly related species because _____
a. the less time since the species diverged, the more lethal DNA mutations will accumulate b. the more time since the species diverged, the more neutral DNA mutations will accumulate c. the less time since the species diverged, the more neutral DNA mutations will accumulate d. the more time since the species converged, the fewer adaptive DNA mutations will accumulate e. all organisms will accumulate lethal DNA mutations at the same rate
Enzyme specificity refers to the
a. specific name of each kind of enzyme. b. fact that enzymes catalyze one particular substrate or a small number of structurally similar substrates. c. effect of temperature on enzyme activity. d. effect of pH on enzyme activity.
In the leaky-barrel model, the weight of the barrel on the hose is analogous to the strength of the:
(a) settling point (b) satiety signal (c) need to defecate (d) hunger signal