A recessive gene for red-green color blindness is located on the X chromosome in humans. Assume that a woman with normal vision (her father is color blind) marries a color-blind male. What is the likelihood that this couple's first son will be color
blind?
A) 100% B) 50% C) 25% D) 0% E) 75%
Answer: B
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Explain how Escherichia coli can grow with a doubling time of 20 minutes when chromosome replication takes 40 minutes
What will be an ideal response?
Matching. Choose the one most appropriate
response for each. 1. ___ centriole 2. ___ centromere 3. ___ chromatid 4. ___ cytokinesis 5. ___ metaphase 6. ___ microtubules 7. ___ prophase 8. ___ telophase 9. ___ anaphase A. cytoplasm apportioned between the two daughter cells B. final phase of mitosis; daughter nuclei reform C. two sister chromatids are joined here D. chromosomes condense and mitotic spindle begins to form E. chromosomes line up at spindle equator F. sister chromatids separate, move to opposite spindle poles H. half of a chromosome in prophase I. in pairs in some eukaryotic cells; move to poles during spindle formation
Oral infections with herpes simplex virus 1 can lie dormant in nerve cells for years, and when a patient becomes stressed, the virus is released, forming cold sores on the lips. Where will the virus be while dormant in the nerve cell?
a. Floating in the nerve cell cytoplasm b. Integrated in the nerve cell chromosomes c. In the nerve cell membrane d. Floating outside of the nerve cell, waiting to reinfect it e. In the blood
Membranous areas in the infant skull that join bones and function to allow for rapid growth of the brain are known as ________
A) osteocytes B) fontanels C) fibrous membrane D) lacunae