In early experiments to understand the control of the cell cycle, researchers fused HeLa cells that were at different
stages of the cell cycle. What did the results of these experiments suggest?
a. The concentrations of cyclin dependent kinases (Cdks) fluctuate throughout the cell cycle.
b. The concentrations of cyclins fluctuate throughout the cell cycle.
c. The cell cycle has three checkpoints through which the cell must pass in order to progress through to mitosis.
d. Microtubules play an essential role in the progression of the cell cycle.
e. Molecules in the cytoplasm control the progression of the cell cycle.
ANSWER: e
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Many defined growth media that support microbial growth lack malonate, which is an important precursor for biosynthesis of lipid membranes. Based on this, we can infer cells also must have a metabolic pathway to generate malonate from other compounds
Indicate whether the statement is true or false.
Being a carrier for sickle cell anemia results in
a. the Red Queen effect. b. genetic drift. c. a balanced polymorphism. d. sexual selection. e. disruptive selection
The aptly named dead horse arum has a heat-producing flower. What advantage does this heat provide?
A) It enables blooms to emerge through snow. B) It prevents inefficient pollinators from collecting pollen. C) It warms the pollinators, which are usually bats. D) It creates a barrier to invasive plant species. E) It increases the evaporation of the scent, attracting pollinators from greater distances.
In the 2009 H1N1 “swine flu” pandemic, the influenza virus underwent a(n) ________, which made it especially deadly. Mortality of individuals ________ than 50 years of age was MOST common
a. antigenic drift / older b. antigenic drift / younger c. reassortment / older d. reassortment / younger