Which of the following statements is not true concerning the fluid transported by the system depicted
in Figure 44-1?
a. It accumulates in a blood cavity called a hemocoel.
b. It is also called hemolymph.
c. It can be found in grasshoppers.
d. It has hemoglobin as the oxygen transporting pigment.
e. It fills spaces called sinuses.
D
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Which of the following could explain how some (although rare) people can have Down syndrome and have a normal chromosome number?
A. One of the cells during development had trisomy 21 but then died. B. A large enough fragment of chromosome number 21 underwent a duplication event. C. A large enough fragment of chromosome number 21 underwent a deletion. D. Some of the genes in one chromosome number 21 are mutated. E. None of the answer options explains this observation.
Which type of communication mechanism travels the best in water?
a. Sound b. Smell c. Taste d. Sight e. All of these choices travel equally as well.
If a bottle of perfume were spilled in the corner of a large lecture hall, the students sitting near that corner of the room would very quickly smell the perfume. Over time, the students sitting in the far corner of the room would smell the perfume. What phenomenon has occurred to the perfume molecules that have entered the air?
a. osmosis c. active transport b. facilitated diffusion d. simple diffusion
The developmental transition during which plants become able to respond to external and/or internal signals that promote flowering is known as
A. perennial development. B. abscission. C. initiation. D. phase change. E. cloning.