What hypothesis did Boehm et al. develop after testing mice (initially) and eventually humans?
A. Because cyclophosphamide works on endothelial cells, natural selection for resistance will not occur in tumor cells.
B. Because cyclophosphamide works on tumor cells, natural selection for resistance will not occur in endothelial cells.
C. Because endostatin works on endothelial cells, natural selection for resistance may arise in tumor cells not initially killed.
D. Because endostatin works on muscle cells, natural selection for resistance may arise in tumor cells not initially killed.
E. Because endostatin works on tumor cells, natural selection for resistance will not occur in endothelial cells.
C. Because endostatin works on endothelial cells, natural selection for resistance may arise in tumor cells not initially killed.
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When plasmogamy occurs in two compatible mating types of fungi, a dikaryotic cell is formed in the hyphae. For some groups of fungi, only one or a few cells are dikaryotic
In other groups of fungi, a majority of the cells that make up the fungal hyphae are dikaryotic. What might be an advantage of having dikaryotic hyphae? A. Dikaryotic hyphae have more nuclei and there can be higher rates of transcription and translation and more digestive enzymes made by each cell. B. Dikaryotic hyphae are able to divide more rapidly than hyphae with only one nucleus. C. Karyogamy can occur in more than one cell and more fruiting bodes can be produced, increasing the number of spores produced through sexual recombination. D. Karyogamy can occur more rapidly when a dikaryotic hypha finds an alternate mating type.
The drug(s) used to treat genital herpes is/are
A. penicillin. B. erythromycin. C. acyclovir. D. famciclovir. E. acyclovir AND famciclovir
Cells in the thyroid gland produce and secrete thyroid hormone (a polymer of amino acids) that helps to regulate metabolism. What organelle is most likely abundant in cells of the thyroid gland?
A) mitochondria B) rough endoplasmic reticulum C) free ribosomes D) lysosomes
Which of the following is (are) proposed to be a function of telomeres?
a) They are required for the complete replication of the chromosome. b) They prevent the ends of chromosomes from fusing with one another. c) They form caps that protect the chromosomes from nucleases and other destabilizing influences. d) All of the choices are correct.