Explain why someone with blood type O-negative is called the universal donor
What will be an ideal response?
Type O-negative blood cells do not have A, B, or Rh antigens. Therefore, the antibodies present in the immune system of any recipient should not react.
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What is the purpose of phosphorylating the carboxy terminal domain (CTD)?
A. Convert from initiation to the elongation stage B. To aid in transcriptional initiation C. Phosphorylate transcription factors D. To aid in promoter recognition
In mitosis, the main difference between plant and animal cells is that
A. plants do not undergo cytokinesis. B. plants produce a cell plate to segregate the daughter nuclei, while animals form a cleavage furrow. C. plants have a central vacuole, while animal cells do not. D. plants produce a cell membrane in cytokinesis, while animals form a cell plate. E. in plants, kinetochore microtubules shorten and draw chromosomes toward the poles; in animals, polar microtubules lengthen to push chromatids apart.
Which statement best explains why modern seedless vascular plants are confined largely to wet or humid environments?
a. They require external water for reproduction. b. They do not have true roots. c. They lack stomata. d. They have a dominant sporophyte generation. e. They do not have flowers or fruits.
Under anaerobic conditions, muscle cells produce ____
a. ethyl alcohol b. acetaldehyde c. pyruvate d. lactate e. citrate