Which level of ecological study focuses the most on abiotic factors?
A) speciation ecology
B) population ecology
C) community ecology
D) ecosystem ecology
Answer: D
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DNA replication can stall as a consequence of the replication machinery encountering hairpin DNA structures that can form due to inverted repeats and palindromic sequences
When DNA replication stalls, double-strand breaks in the DNA can occur, causing severe genetic and cellular consequences. Both Werner syndrome (premature onset of age-related phenotypes and cancer) and Bloom syndrome (cancer) are the result of mutations in helicase, an enzyme that unwinds hairpin structures. Helicase most likely breaks which type of bonds in a hairpin? A. glycosidic B. phosphodiester C. hydrogen D. peptide E. covalent
High altitude acclimatization results in all of the
following EXCEPT a. increased production of erythropoietin. b. increased blood-cell production. c. decreased workload for the heart. d. an increase in blood viscosity. e. increased O2 concentration in the blood.
The world's first photosynthetic organisms were also the first to adapt to intertidal zones. What is the name of the group that includes these organisms?
a. plants b. cyanobacteria c. algae d. fungi
Apoptosis:
a. decreases the number of cells in the body b. is programmed cell death c. is a natural process d. All of these are correct.