According to the fluid mosaic model of cell membranes, the fluid part of the model refers to ____
a. the constant movement of the hydrophilic tails in the interior of the membrane
b. a thin layer of water found sandwiched between the two layers of phospholipids
c. the phospholipid molecules which vibrate, spin, and exchange places within the same layer of the bilayer
d. the free movement of cholesterol molecules within the membrane
e. the frequent flip-flop of phospholipids from one side of the membrane to the other
ANSWER: c
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____ learning is also called ____ and occurs when an animal learns that two events are correlated
Fill in the blank with the appropriate word.
The invertebrate group most closely related to the vertebrates is:
A. Echinodermata B. Urochordata C. Cephalochordata D. Ophiouroidea E. Notochordata
In transduction, bacterial cells ____
a. take up pieces of DNA that are released as other cells disintegrate b. receive DNA from an infecting phage c. replicate DNA molecules d. make replicate copies of one another e. generate their own DNA
Which of the following is NOT an advantage
of asexual reproduction? a. Asexual reproduction is faster than sexual reproduction. b. Individual organisms do not have to seek mates. c. Asexual reproduction promotes variation. d. Asexual reproduction is less energetically costly than sexual reproduction. e. In stable environments the offspring are as well adapted as the parents