Proteins are large, organic biomolecules that consist of varying arrangements of amino acids linked together by peptide bonds. in which of the following cellular processes are proteins involved?
a. cellular communication
b. cellular regulation
c. cellular reproduction
d. all of these

Which of the following is the most likely result of converting forestland to urban development? a. the amount of land available for lumber production decreases. b. fewer trees are needed because cities are made mainly of concrete. c. people discover more efficient ways to grow trees. d. the price of lumber goes down.

Where would you expect to see seedless plants, such as ferns and mosses? a. in a botanical museum, because they are all extinct b. low and close to the ground in a moist environment c. climbing high while circling the branches of another plant d. deeply rooted in a forest with a trunk that reaches 20 meters or more

Explain why phospholipid molecules form a bilayer. (3 marks)