Franks and his colleagues investigated the effects of drought on mustard plants by:
a. hypothesizing that mustard plants from postdrought populations flowered earlier than mustard plants from the same populations before the drought.
b. growing seeds stored before the drought to compare with plants growing after the drought.
c. concluding that flowering times had shortened by comparing plants growing before the drought to plants growing after the drought.
d. All of the above.
e. A and C.
D
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True or false: In the sequence AGGCCT, an available phosphate group would be found at the 5' end of the nucleotide labeled "T."
A. true B. false
Which of the following hominin lineages is correct?
A. Homo ergaster Homo erectus Homo sapiens B. Homo ergaster Homo neanderthalensis Homo sapiens C. Homo ergaster Homo habilis Homo sapiens D. Homo ergaster Homo heidelbergensis Homo sapiens E. Homo ergaster Homo rudolfensis Homo sapiens
Which one of the following best explains how water moves freely across a plasma membrane?
A) Water moves directly through the phospholipid bilayer because of the charges on phospholipids. B) Water is brought into the cell by facilitated diffusion but released by exocytosis. C) It is actively transported across the membrane. D) Water moves through protein-lined channels in the plasma membrane. E) The passage of water across a plasma membrane requires facilitated transport.
If a ball begins to roll down an incline, its ________ energy is converted into ________ energy.
Fill in the blank(s) with the appropriate word(s).