A ________ plasma membrane allows water but not solutes to pass through it
Fill in the blank(s) with correct word
semipermeable
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In a plant, __________ represent a source and __________ represent a sink
a. leaves; fruits b. fruits; leaves c. roots; leaves d. roots; fruits
At the current rate of description, how long will it take to compile a complete catalog of life on Earth?
a. 5 years b. 50 years c. 500 years d. 5000 years
In the classic experiments by Bracht and Hammerling, the nucleus of Acetabularia was removed, the
cap was cut off, a nucleus of a different species was inserted, and the cap was allowed to regenerate. The new cap was then removed. After the second regeneration, the cap was observed, and the following conclusion was made:a. The shape of the cap was controlled by the nucleus, thus, the nucleus was the control center of the cell. b. The shape of the cap was under the control of the stalk, which produced a control substance. c. The shape of the cap was independent of both the stalk and the holdfast. d. The "cren" caps were defective due to some mutation in the cap. Thus, "cren" caps are independent of control from both the base and the holdfast. e. At the time no conclusion could be made because in the early 20th century, biologists did not know about the composition of DNA.
Refer to the accompanying figure with the lateral line organs of fishes. The structures indicated by label 3 are:a
hair cells. b. cupula. c. stereocilia. d. sensory neurons. e. supporting cells.