Cyclophosphamide forms cross links between the two strands of DNA in a chromosome. How would this be effective in chemotherapy?
A. It would block splicing.
B. It would activate oncogenes.
C. It would block DNA replication.
D. It would block metaphase.
E. It would inactivate tumor suppressors.
C. It would block DNA replication.
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What insight did Nettie Stevens's studies of the beetle Tenebrio molitor provide about the chromosome theory of inheritance?
A) Genes are located on chromosomes. B) The number of autosomal chromosomes varied between gametes. C) Crossing over occurs between homologous chromosomes. D) Sex is determined by the presence of an X or Y chromosome in the male gamete. E) Chromosomes assort independently into the haploid gametes.
Which hormone promotes stem elongation and was first discovered while studying the growth of extremely tall and
spindly rice plants? a. abscisic acid b. auxin c. cytokinin d. ethylene e. gibberellin
What is the type of microscope that is used nearly always to observe this specimen?
A) scanning electron microscope B) stereomicroscope C) monocular microscope D) transmission electron microscope
Which one of the following is characteristic of Neisseria meningitis but not Neisseria gonorrhoeae?
A. Contains a polysaccharide capsule B. Is oxidase-positive C. Most isolates show resistance to penicillin D. Ferments glucose E. No effective vaccines are available