The branches of adaptive immunity are
A) the cellular response, the humoral response, and the memory response.
B) the humoral response and the memory response.
C) the cellular response and the humoral response.
D) the antigen response and the memory response.
E) the cellular response and the memory response.
Answer: C
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Human chromosome 2 appears to be:
A. a fusion product of two simian chromosomes. B. significantly different from simian chromosome 2. C. 50% homologous to simian chromosome 2. D. primarily coding for human traits.
According to fossil records, mammals
A. first appeared in the same geologic era, the Mesozoic, as dinosaurs. B. first appeared in the current Quaternary period of the Cenozoic era. C. lived in the same era, the Paleozoic, as reptiles, amphibians, and bony fishes. D. did not appear until the Cenozoic era, after dinosaurs were extinct. E. None of the answer choices is correct.
For a P1 transduction experiment, an E. coli donor strain with the genotype arg+, ser+, ampR and a recipient strain with the genotype arg-, ser-, ampS were used
The following results were obtained for each marker: Of the transductants selected for arginine, 5% are ser+ and 30% are ampR. Of the transductants selected for serine, 3% are arg+ and 0% are ampR. What is the correct order and relative distance of these three genes on the E. coli chromosome?
Which of the following statements is NOT correct about the arrangement of tissues in the eudicot root?
A. The star-shaped phloem is located in the center of the vascular cylinder, with xylem arranged between the arms of phloem. B. The pericycle is the outer layer of cells in the vascular cylinder, with the ability to form secondary or branch roots. C. The epidermis of the root has no cuticle on its outer surface, unlike other epidermal tissues. D. The Casparian strip is a waxy lining on four sides of the cells of the endodermis, which forces water into the endodermal cells. E. The specialized root tissues are seen at the zone of maturation.