What is the significance of the minerals present in hydrothermal vents in the surface metabolism model of chemical evolution?
provided kinetic energy for the formation of organic molecules.
B) The minerals helped catalyze the formation of organic molecules.
C) The minerals helped nonpolar molecules dissolve in water.
D) The minerals became incorporated into functional groups.
B) The minerals helped catalyze the formation of organic molecules.
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Non-disjunction is the failure of homologous chromosomes to separate during meiosis I, or the failure of sister chromatids to separate during meiosis II or mitosis. As a result, both homologous chromosomes or both sister chromatids migrate to the same pole of the cell. This produces daughter cells with an imbalance of chromosomes. A cell biologist examines the final products of meiosis in an earthworm (2n=36) and finds 2 cells with 20 chromosomes, and 2 cells with 16 chromosomes. Most likely this was because
A. 2 pairs of sister chromatids failed to separate during meiosis II. B. 1 pair of sister chromatids failed to separate during meiosis II. C. 2 pairs of homologous chromosomes failed to separate during meiosis I. D. 1 pair of homologous chromosomes failed to separate during meiosis I. 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 non-disjunction? 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?
A nonfunctional gene near a similar but functional gene is called a(n)
A) pseudogene. B) expanded gene. C) phenocopy. D) transposon.
You are on the committee to update the design of the hospital NICU (neonatal intensive care unit), which currently has incubators for the babies but not much else. Based on what you have learned about Harlow's experiments with rhesus monkeys, what would you suggest adding to the NICU to improve the babies' health and well-being?
A. comfortable chairs for parents to hold their babies B. pheromones C. white-noise devices to mask the sound of beeping machines D. softer lighting
The MOST common disease caused by food infection due to Salmonella enterica is
a. enteric fever. b. enterocolitis. c. osteomyelitis. d. septicemia.