DNA contains all of the following nitrogencontaining
bases EXCEPT
a. adenine.
b. uracil.
c. guanine.
d. adenine.
e. thymine.
B
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Clusters of chlorophyll and accessory pigments are called ________.
A. the Golgi apparatus B. chloroplasts C. photosystems D. photosynthetic membranes
What occurs during exhalation?
a. Oxygen is taken in through the nasal cavity. b. Oxygen is released back into the air. c. Carbon dioxide is released back into the air. d. Carbon dioxide is taken in through the nasal cavity.
Salivary glands secrete ________ to start the digestion of ________.
A. amylase; fats B. amylase; starch C. trypsin; proteins D. lactase; milk E. pepsin; proteins
Which of the following statements about post-translational modifications is false?
A) Additional inorganic factors could be added. B) Post-translational modifications can include the addition of extra amino acids. C) Post-translational modifications are often required for a protein to function. D) Post-translational modifications provide a way for cells to regulate gene product functionality. E) Additional organic factors could be added.