Which agent of evolutionary change occurs when a population's allele frequency is altered due to chance?
A. genetic drift
B. gene flow
C. nonrandom mating
D. natural selection
Ans: A. genetic drift
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During the M checkpoint, the cell ____
a. proceeds to interphase and completes DNA replication b. proceeds to G2 phase and the cell prepares to divide c. proceeds to S phase or enters inactive G0 state d. monitors attachment of spindle fibers to chromosomes e. monitors completion of DNA synthesis and DNA damage
What structure is present within a follicle?
A. vaginal cleft B. labia C. mucus-secreting glands D. oocyte E. clitoris
The first photosynthetic organisms to obtain hydrogen by splitting water were the cyanobacteria
______________ Indicate whether the statement is true or false.
Ecosystem diagrams help us visualize the flow of ___________.
A. matter and energy B. rivers and streams C. seasonal change D. happiness E. goods and services