Eyes are relatively vulnerable to infection because
A. there is scant normal microbiota to serve a protective role.
B. immune privilege restricts access to the cells conferring innate immunity.
C. they are not covered by keratinized epithelium.
D. All of these answers are correct.
Answer: D
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Why are there fewer tRNA anticodons than the 61 needed to match each mRNA codon that codes for an amino acid?
A. There is some flexibility in pairing between the 5' base of the codon and the 3' base of the anticodon. B. There is some flexibility in pairing between the middle base of the codon and the middle base of the anticodon. C. There is some flexibility in pairing between the 3' base of the codon and the 5' base of the anticodon. D. There is some flexibility in pairing between all 3 bases of the codon and all 3 bases of the anticodon.
Our closest extinct relative is
a. Homo erectus b. Homo habilis c. Homo neanderthalensis d. Australopithecus afarensis e. Australopithecus africanus
Competition for resources is a density-independent factor affecting a population
Indicate whether the statement is true or false
Which of the following types of organisms are not composed of eukaryotic cells?
A) fungi B) bacteria C) plants D) animals E) protists