Which of the following is true about the structure of DNA?
A. Purine and pyrimidine bases are joined by phosphodiester bonds.
B. Adjacent bases are stacked on top of each other, one base pair every 0.34 nm.
C. Purine and pyrimidine bases are attached to the 1'-carbon of the deoxyribose sugars.
D. All of the choices are correct.
Answer: D
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The fluid filling the space around the CNS is termed
A. cerebrospinal fluid. B. interstitial fluid. C. lymph. D. blood. E. arachnoid fluid.
What is the difference between Ras and the G proteins bound to G protein coupled receptors (GPCRs)?
A. Ras is an enzyme and the G proteins bound to GPCRs are not enzymes. B. Ras is a second messenger and the G proteins bound to GPCRs are not second messengers. C. Ras is a small G protein and the G proteins bound to GPCRs are not small G proteins. D. Ras can activate different effector molecules and the G proteins bound to GPCRs cannot activate different effector molecules.
How do the antibodies of sharks differ from those of mammals?
a. Shark antibodies do not have light chains. b. Shark antibodies do not have heavy chains. c. Shark antibodies have a different arrangement of embryonic gene segments. d. Shark antibodies are produced without rearrangement of gene segments. e. Shark antibodies have light, heavy, and moderate chains.
The fossil record has established that prokaryotes existed on Earth for approximately two billion years before eukaryotes appeared.
Answer the following statement true (T) or false (F)