In clinical trials, control groups of individuals who receive a safe but noneffective treatment instead of the drug being studied are being given ________
A) stem cells
B) a placebo
C) a double-blind trial
D) efficacy
E) None of these choices
B
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Salamanders normally go through a juvenile stage in which they have external gills. Most salamanders lose these gills when they develop into adults, but axolotl salamanders retain gills into adulthood by suppressing metamorphosis. This is an example of
A. gene duplication. B. co-opting a gene for a new function. C. homeosis. D. heterochrony. 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 already know about heterochrony? Consider Possibilities · Consider the different answer options. Which can you rule out? 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?
In a certain population, 40 of every 1,000 births results in an individual that suffers from cystic
fibrosis. What is the allele frequency for the recessive allele that causes cystic fibrosis? a. 0.004 b. 0.02 c. 0.2 d. 0.4 e. 0.8
Lungs absorb oxygen from inhaled air, and the small intestine move ingested material through the
digestive tract and absorbs nutrients from ingested food. Which of the following statements describes the type of epithelium you would expect to line each of these surfaces? a. They are both lined by a simple squamous epithelium. b. They are both lined by a simple cuboidal epithelium. c. The lungs are lined by a simple squamous epithelium, and the small intestine is lined by a ciliated columnar epithelium. d. The lungs are lined by a columnar epithelium, and the small intestine is lined by a simple squamous epithelium. e. The lungs are lined by a simple squamous epithelium, and the small intestine is lined by a simple cuboidal epithelium.
The chemiosmotic theory explains
A) the phosphorylation of ADP. B) the electron transport chain. C) the differences between inner and outer mitochondrial membranes. D) the source of energy for formation of mitochondrial ATP. E) aerobic respiration.