Which stages of meiosis is most poorly understood?
a. how daughter cells are cleaved
b. how homologous chromosomes are separated
c. how homologous chromosomes pair
d. the mechanism of crossing-over
e. how the regulatory pathways of meiosis operate
ANSWER: e
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Which of the following organisms would NOT be classified in the Domain Eukarya?
A. Canis lupis (wolf). B. Loxodonta cyclotis (forest elephant). C. Salmonella enterica (bacteria that causes food poisoning). D. Aleuria aurantia (ascomycete fungi). E. Sequoiadendron giganteum (Giant Sequoia tree).
The p53 gene is a tumor-suppressing gene that prevents damaged cells from undergoing cell division. If this gene ceases to function due to a mutation, what will happen to the cell?
A) Tumors will be suppressed. B) The cell will be prevented from undergoing division. C) The cell will die. D) Uncontrolled cell division will occur.
Carl Woese's evolutionary studies that led him to propose the three domain taxonomic system compared nucleotide sequence present in:
A) the nuclei of eukaryotic cells B) 16S rRNA genes C) cyanobacteria D) thermophiles E) DNA polymerase genes
Ants, termites, and some other insects as well as
mole-rats are __________. Fill in the blank(s) with the appropriate word(s).