During aerobic respiration, which of the following directly donates electrons to the electron transport chain at the lowest energy level?
A) NADH
B) ATP
C) ADP + i
D) FADH2
D
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We now know that chloroplasts are derived from which group of free-living organisms?
a. mitochondria b. algae c. cyanobacteria d. archaea
A region of a chromosome contains two strands of DNA, yet only one is used to transcribe a gene because
A. both strands are transcribed, but only one strand of DNA contains a reading frame. B. all genes are found on the same strand of DNA in a chromosome. C. the start of transcription is random along the chromosome and doesn't always occur on a gene. D. RNA polymerase binds to the terminator, stopping transcription on one strand of DNA. E. RNA polymerase binds to the promoter, which precedes the gene only on the template strand of DNA.
The phase of the bacterial growth curve in which the rate of multiplication equals the rate of cell death is the ________.
A. stationary phase B. telophase C. exponential phase D. death phase E. lag phase
The process of aging is described by the term ____
a. senescence b. puberty c. neonate d. morulation e. fetalism