Different types of proteins are found on the surface or embedded in the plasma membrane of a
cell. Which of the following is a function of these proteins?
a. to transport substances
b. to receive signals from the nervous system
c. to allow for recognition among cells
d. all of these
D
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Cells that are the main water-conducting cells of a
plant are a. sclereids. b. tracheids. c. sieve tubes. d. parenchyma. e. all of these.
In addition to hydrogen bonding, what type of bonds may exist in the quaternary structure of a protein?
a. ionic b. coordinate c. disulfide d. network e. diphosphate
The barbed (fast growing) end of actin filaments is located in muscle
a. at the AI junction. b. near the M line of a contracted sarcomere c. at the inner margin of the AI zone d. at the Z disc e. none of the above
Sponges and worms belong to the domain ________
Fill in the blank(s) with correct word