Downward bending of a seedling root can be blocked by ____.
A. moving it to a dark room
B. exposing the seedling to continuous light
C. turning the seedling upside down
D. inhibiting cytokinin transport upwards
E. inhibiting auxin transport downwards
Answer: E
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Which one of the following directly interacts with the DNA as a transcriptional regulator?
A. cAMP B. G protein C. Protein kinase A D. CREB protein dimer E. Glucocorticoid response element
Mutagenesis ____
a. is an example of spontaneous mutation b. acts directly on proteins by causing them to unfold c. occurs due to a single mRNA being translated by too many ribosomes simultaneously d. is the production of mutations in a laboratory by exposure of a living organism to a mutagen e. occurs when errors made by DNA polymerase are not repaired
Given that the nature of DNA replication in eukaryotes is not as well understood as in prokaryotes, (a) present a description of DNA (chromosome) replication as presently viewed in eukaryotes and (b) state the differences known to exist between
prokaryotic and eukaryotic DNA replication.
Which of the following occurs during mitosis but not during meiosis 1?
A. The chromosomes are pulled to opposite poles of the spindle apparatus B. The chromatids of each chromosome are separated C. The nuclear envelope breaks down D. Both synapsis and crossing over take place E. The diploid number of chromosomes is reduced to the haploid number