In a lipid bilayer, the _____ of all the lipid molecules are sandwiched between all the _____
a. hydrophilic tails; hydrophobic heads
b. hydrophilic heads; hydrophilic tails
c. hydrophobic tails; hydrophilic heads
d. hydrophobic heads; hydrophilic tails
C
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Distinguish between pollination and fertilization.
What will be an ideal response?
In which of the types of hearts is oxygen-rich
and oxygen-poor blood mixed?
a. two-chambered b. three-chambered c. four-chambered d. two and three-chambered e. all three types of hearts
Which of the following is not a characteristic of parenchyma cells?
a. They all lack the ability to photosynthesize. b. They can differentiate into other kinds of cells in response to an injury to the plant. c. They may contain various storage materials, such as starch grains, oils, or water. d. They must be living cells in order to function. e. They may secrete substances of various types.
Codons that serve as "stop" signals for translation are recognized by
A. anticodons. B. aminoacyl-tRNA synthetases C. translation terminators. D. tRNA. E. release factors.