The primary building block (monomer) of nucleic acids is
A. a group of four interconnected rings.
B. a nucleotide.
C. an amino acid.
D. a glucose molecule.
E. a fatty acid.
B. a nucleotide.
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A scientist produces an artificial membrane from phospholipids and notices that oxygen, but not glucose readily moves through the membrane. What might account for the inability of glucose to move through the artificial membrane?
A. The artificial membrane lacked a protein needed for glucose transport. B. The artificial membrane lacked the appropriate types of phospholipids for glucose transport. C. Oxygen readily passes through the membrane, so glucose should have as well. D. The membrane lacked an adequate amount of amphipathic molecules for glucose transport. E. Thermodynamics does not allow glucose to pass through membranes produced either artificially or from living organisms.
The haploid stage of the red algae life cycle is called:
a. sporophyte. b. zygote. c. gamete. d. gametophyte. e. tetrasporophyte.
A positive serological test for tuberculosis indicates that the patient
A. is immune to tuberculosis. B. is an asymptomatic carrier of tuberculosis. C. has active tuberculosis. D. has been exposed to tuberculosis.
G protein-linked receptors are transmembrane proteins that convert a(n) extracellular hormone signal into an
intracellular signal that affects certain cell processes. Indicate whether the statement is true or false.