What is the oxidized form of the most common electron carrier that is needed for both glycolysis and the Krebs cycle?
A. pyruvate
B. ATP
C. NAD+
D. FAD
E. acetyl-CoA
Answer: C
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The calcium ions released into the cytosol during excitation of skeletal muscle bind to _____
A) troponin complex B) transverse tubules C) actin D) myosin
Brittany and Jarod have been trying to have a second child for 10 years. They have one healthy child, but Brittany has had four early, spontaneous abortions. The most likely explanation for the many pregnancy losses is that Brittany and Jarod
A) are not having sex frequently enough. B) are each heterozygous for lethal alleles of the same gene. C) are each homozygous for lethal alleles of the same gene. D) have different alleles for all of their vital genes.
A plasmid is a
a. small segment of DNA that is often isolated from virus chromosomes for cloning purposes. b. large linear segment of DNA that is often isolated from bacterial chromosomes for cloning purposes. c. small circular segment of DNA in bacteria that is linked by hydrogen bonds to the main bacterial chromosome. d. large circular segment of DNA in bacteria that is completely separated with the chromosome. e. small circular segment of DNA in bacteria that is completely separated from the chromosome.
Beta- carotene is converted to vitamin ___ in
the cells of the small intestine.
a. B12 b. A c. E d. C e. D