Which of the following is not an example of the relationship between structure and function in proteins and nucleic acids?
A. Glycosylation of RNA can be important for cell-surface differentiation between "self" and "nonself."
B. Methylation of DNA is important for accurate DNA replication.
C. Modification of RNA bases can be important for biological activity.
D. Modification of amino acids can be important for binding of proteins to other molecules.
E. Phosphorylation of amino acids can be important for biological activity of proteins.
A
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The muscular digestive organ of birds in which food is ground into small bits is the
a. lumen b. gizzard c. crop d. stomach e. cloaca
Which scientist is given credit for proposing the endosymbiont theory?
A. Svante Arrenhius B. Charles Darwin C. Stanley Miller D. Louis Pasteur E. Lynn Margulis
The continuous, low-level extinction rate of species is referred to as:
a. minimal extinction. b. mass extinction. c. background extinction. d. temporal extinction. e. selective extinction
Refer to Figure 44-2. Which cell type is the source of antibodies?
a. A only b. B only c. C only d. D only e. both A and B