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A 47 year old teacher goes to her physician complaining of dizziness, fainting, and shortness of breath. She appears pale and chronically ill. Her heart rate is 70/min supine and 68/min sitting and standing. Her blood pressure is 120/74 supine, 98/54 sitting, and 84/48 standing. Heart sounds and lung sounds […]

A mutation has occurred in an animal population so that the homozygous recessive condition (ff) results in a fatal disease for the animal. Affected individuals die soon after birth. The homozygous dominant (FF) and the heterozygous (Ff) individuals live normally. A study of the population over one year found that […]

Among bryophytes, only the sporophytes of mosses and hornworts have stomata, whereas stomata are missing from liverwort sporophytes. If the common ancestor of all bryophytes had sporophytes that bore stomata, then which of these might account for their absence from liverwort sporophytes? If, in contrast to early mosses and hornworts, […]

The space probe HEA1 returns to earth following a trip to the planet Tantoun. Analysis of samples from this planet reveals that proteins are composed of 16 different amino acids, while DNA contains only two bases: rosine (R) and ziadine (Z). a) What is the minimum codon size in this […]