Communication among neurons and between neurons and other target cells occurs across short distances at a structure called the __________, a region where the signaling cell and the target cell are very close together.
a. catecholamine
b. neurotransmitter
c. synapse
d. epinepherine
Answer: c. synapse
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Without data from the base composition studies of Chargaff, what might Watson and Crickâs modeling studies have erroneously concluded?
A. Bases could pair with themselves (e.g. A with A, C with C). B. Any purine could pair with any purine. C. Any pyrimidine could pair with any pyrimidine. D. Any purine could pair with any purine and any pyrimidine could pair with any pyrimidine. E. Any purine could pair with any pyrimidine.
Ethanol, the alcohol found in wine and beer, has the molecular formula CH3CH2OH. What is the molecular weight of
ethanol if the atomic weight of C=12, H=1 and O=16?
a. 29 g/mol b. 30 g/mol c. 34 g/mol d. 45 g/mol e. 46 g/mol
Below is a pedigree of a human genetic disease in which solid color indicates affected individuals. Assume that the disease is caused by a gene that can have the alleles A or a. What is/are the possible genotype(s) of person 3?
A) AA
B) Aa
C) Either AA or Aa
D) aa
E) Cannot be determined
Which statement about lipid bilayers is false?
a. They are inflexible. b. They are self-sealing. c. They resist forming free ends. d. They can fuse with other bilayers. e. They spontaneously form closed vesicles