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. quaternary
B. peptide
C. tertiary
D. primary
E. secondary
Answer: D
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The structure labeled "7" is the
a. food vacuole. b. gullet. c. macronucleus. d. micronucleus. e. mitochondrion.
Which of the following statements most likely
apply to the earliest cells?
a. They were prokaryotic cells. b. It is likely that earliest cells did not have a nucleus but had membrane-bound organelles. c. The earliest cells may have used oxygen gas in order to thrive successfully. d. Energy from the sun may have been used by the earliest cells. e. All of these statements most likely apply
The base composition in DNA isolated from cow liver cells is 28% adenine; what percent of the bases are cytosine?
A) 14% B) 22% C) 28% D) 36% E) 56%
The nucleolus is the site of:
A. ribosome assembly. B. uncoiling and unraveling of chromosomes. C. lipid synthesis. D. protein synthesis. E. chromosome replication.