Why is a rhizoid not considered a true root?
A. Rhizoids are not capable of absorbing water.
B. Rhizoids lack xylem tissue.
C. True roots have mycorrhizal fungi.
D. Only true roots are capable of nitrogen fixation.
E. Rhizoids lack the capacity to anchor mosses into the substrate.
Answer: B
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A mutation of a segmentation gene can result in all of the following EXCEPT
A. duplication of body parts B. missing body regions C. replacement of one body part with another D. altered expression of homeotic genes E. incorrect establishment of body axes
Your colleagues are attempting to study the citric acid cycle in the lab. To do so, they have dissolved oxaloacetate in water, then stirred in sufficient quantities of every required enzyme, coenzyme, and oxidizing agent, before adding ADP and acetyl CoA. After waiting a sufficient period of time, they test the solution for ATP and are disappointed to find significantly less ATP than expected. What is the flaw in their experiment?
a. Pyruvate dehydrogenase is not water soluble and is unable to convert pyruvate into acetyl CoA outside mitochondria. b. Stirring the solution will introduce oxygen molecules, which will bond to ADP, preventing further phosphorylation. c. Without subsequent pathways to oxidize NADH and FADH2, no NAD+ and FAD are available to continue the cycle. d. ADP molecules spontaneously dephosphorylate in the presence of acetyl CoA outside of mitochondria.
What is a key difference between prokaryote genomes and the genomes of multicellular eukaryotes?
A) Multicellular eukaryote genomes have a greater number of protein-coding genes than prokaryote genomes. B) Prokaryote genomes have more introns than multicellular eukaryote genomes. C) Multicellular eukaryote genomes have larger intergenic regions than prokaryote genomes. D) There are more mobile genetic elements in prokaryote genomes than in multicellular eukaryote genomes.
ob/ob mice
What will be an ideal response?