Endosymbiosis of cyanobacteria is widely accepted as an explanation for the development of chloroplasts. The presence of endosymbiotic cyanobacteria provided a cell with the advantage of ________.
A. a membrane-bound nucleus
B. tolerance to oxygen
C. an electron transport chain
D. simple, rapid gene transfer
E. photosynthesis
Answer: E
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Why does sexual reproduction produce more genetic variability in a population?
A. Offspring are genetically identical to one parent. B. During sex adults can exchange genetic material thus increasing their variability. C. Organisms arising from sexual reproduction can change their genetic material in response to environmental changes. D. Sexually-reproducing organisms mutate more rapidly than asexually reproducing organisms. E. Offspring are a genetic mix of both parents.
Discontinuous replication refers to the fact that
A. DNA synthesis begins at multiple origins of replication. B. one of the daughter strands of a replicated piece of DNA is made in short fragments that are joined together. C. DNA synthesis is not continuous with RNA synthesis. D. DNA synthesis starts and stops many times before completed.
________ a superior projection on the ________ bone, attaches to the dura mater and secures the brain within the skull.
Fill in the blank(s) with the appropriate word(s).
In the sigmoid growth curve, the carrying capacity of the environment is indicated by what symbol?
A. dN/dt B. ri C. N/K D. K E. N