Pyruvate
A) forms at the end of glycolysis.
B) is the molecule that starts the citric acid cycle.
C) is the end product of oxidative phosphorylation.
D) is a six-carbon molecule.
Answer: A
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Scientists attempted for many years to conduct nuclear transplants but failed. However, geneticists had success in cloning a sheep. They were successful because they
A. picked a cell very early in development. B. replicated the blastomeres before insertion. C. delayed transcription in the blastomeres. D. treated the nucleus with sheep plasma before nuclear insertion. E. utilized a new micro pipette technique.
In the process of diffusion, molecules move from areas where
A. their concentration is higher to areas where their concentration is lower using energy from ATP. B. their concentration is lower to areas where their concentration is higher through specific protein channels or carriers. C. their concentration is lower to areas where their concentration is higher until an equilibrium is reached. D. their concentration is higher to areas where their concentration is lower until an equilibrium is reached.
Which of the following is not part of sexual reproduction?
a. The segregation of homologous chromosomes during gamete formation b. The fusion of sister chromatids during fertilization c. The fusion of haploid cells from a diploid zygote d. The reduction in chromosome number during meiosis e. The production of genetically distinct gametes during meiosis
What are soil particles that are decomposing organic matter called?
a. sand b. humus c. silt d. clay