Most electron carriers are ________.
A. enzymes
B. inorganic phosphate
C. hydrogen
D. coenzymes
Answer: D
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A cell biologist examines a diploid cell from a particular species of butterfly during prometaphase of mitosis and determines that 10 centromeres are present. Based on this finding, how many chromatids should be present in a single cell from this species in metaphase I of meiosis?
What will be an ideal response? Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you know about the number of chromatids in a cell? How does it relate to the question? Consider Possibilities · What other information is related to the question? Which information is most useful? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Homologous chromosomes pair with each other during meiosis, but are misaligned. Which of the following is a possible outcome if crossing over occurs?
A. One daughter chromosome contains a gene duplication. B. One daughter chromosome contains a gene deletion. C. Two daughter chromosomes each contain a gene duplication. D. Two daughter chromosomes are normal. E. One daughter chromosome contains a gene duplication, one daughter chromosome contains a gene deletion, and two daughter chromosomes are normal.
Answer the following statements true (T) or false (F)
1. All diseases caused by Rickettsia spp. are arthropodborne. 2. Viruses contain both DNA and RNA. 3. The cell walls of archaeans contain a thicker layer of peptidoglycan than bacterial cell walls. 4. On entering a bacterial cell, all bacteriophages immediately initiate the lytic cycle. 5. Mycoplasmas cannot grow on artificial media.
Figure on p. 737
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Use the figure above showing the process of gastrulation to answer the following question.
The letter "A" in the accompanying figure represents ____.
A. ectoderm B. endoderm C. mesoderm D. neural plate E. yolk