Comparison of the wings of birds and the wings of bats reveal that they____
a. are completely homologous structures
b. are completely analogous structures
c. are completely homoplastic structures
d. are vestigial structures
e. have homoplastic and homologous components
ANSWER: e
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Which of the following is an example of cardiac output?
a. The hummingbird heart beats approximately 800 times per minute. b. During exercise, the heart rate in humans can double. c. The human heart pumps about 1500 gallons of blood per day. d. All of these are examples of cardiac output.
As embryonic cells divide during cleavage, the daughter cells ____
a. grow to the same size as the parent cell b. become progressively smaller c. become progressively larger d. are different in size from each other and the parent cell e. may increase or decrease in size depending on their position
The reptile group most closely related to the birds is
the a. turtles. b. snakes. c. lizards. d. tuataras. e. crocodilians.
At temperatures higher than the maximum growth temperature for an organism
A. proteins are permanently denatured. B. membranes become too fluid for proper function. C. hydrogen bonds within molecules are broken. D. hydrogen bonds are broken and proteins are permanently denatured. E. hydrogen bonds are broken, proteins are denatured, and membranes become too fluid.