Adult giraffes can be up to 20 ft tall, and thus require special adaptations to maintain appropriate blood pressure. One adaptation is the rete mirabile, a group of blood vessels that form a web or net-like structure to slow blood flow.The giraffe, as the tallest living land animal, has several adaptations for its height. To prevent blood from pooling in the head when it bends down to drink, the jugular veins of a giraffe have multiple one-way valves. Furthermore, a web of arteries and veins in the neck called the rete mirabile ("wonderful net") slows the flow of blood into the brain. These specializations of the ________ act as mechanisms to maintain ________.
A. nervous system; temperature homeostasis
B. nervous system; homeothermy
C. circulatory system; pH homeostasis
D. circulatory system; blood pressure homeostasis
Answer: D
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In bacteria, a unique RNA that binds the A site of the ribosome and directs the addition of approximately 12 amino acids to the nascent peptide when no stop codon is present is called the ________.
Fill in the blank(s) with the appropriate word(s).
The division of the lateral meristem
a. results in the production of primary tissue. b. causes an increase in the length of roots. c. produces floral tissue. d. gives rise to the epidermis. e. increases the diameter of roots and stems.
Heat is required for the polymerase chain reaction. Indicate whether the statement is true or false
Why does active transport require ATP?
a) An input of energy is needed to allow the movement of molecules from an area of low concentration to one of higher concentration. b) An input of energy is needed to speed up the rate of facilitated diffusion. c) An input of energy is needed to maintain the conformation of transport proteins. d) An input of energy is needed to both speed up the rate of facilitated diffusion and maintain the conformation of transport proteins.