Sickle cell anemia is a condition in which red blood cells exhibit a characteristic "sickle" shape. This arises from a mutation or change in one of the amino acids found in hemoglobin. A single amino acid mutation would directly affect a protein's _______ structure.
A. primary
B. secondary
C. tertiary
D. quaternary
E. peptide
A. primary
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Viruses ________.
A. cannot be seen in a light microscope B. undergo binary fission C. contain 70S ribosomes D. are prokaryotic
Dependence on animal vectors for fertilization and dispersal is characteristic of many species of ____
a. ferns b. angiosperms c. mosses d. conifer e. cycads
Which of the following is true of testicular cancer?
A. An undescended testis faces small risk of cancer. B. It can be detected with the help of a Pap test. C. Its cause has not been ascertained yet. D. Every lump in the testes is cancerous
Water's density and, consequently, its buoyancy decrease at warmer temperatures. Based on this consideration and using data from the table above, at which time of year should one expect diatoms to be storing excess calories mostly as oil?
A) mid-winter B) early spring C) late summer D) late fall