Which of the following is a FALSE statement concerning amino groups? Amino groups _____
A) are basic with respect to pH
B) are found in amino acids
C) contain nitrogen
D) are nonpolar
D
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Albinism is a recessive disorder in which the skin and hair fail to produce pigment. The following question(s) ask you to evaluate the pedigree chart shown here in which "N" is the allele for normal pigmentation and "n" is the allele for albinism. The shaded circles for Deirdre and Shannon represent the only individuals expressing the disorder.
What is Deirdre's phenotype?
A. Normal B. nn C. Albino D. Cannot be determined
Excessive iron absorption and accumulation to toxic levels is associated with _____
A) excessive blood volume B) a liver abnormality that results in a decreased number of red blood cells C) various forms of inherited or acquired anemia D) the genetic disorder known as hemochromatosis E) menstruation and menopause
At an autosomal gene locus in humans, the allele for brown eyes is dominant over the allele for blue eyes. At another gene locus, located on the X chromosome, a recessive allele produces colorblindness while the dominant allele produces normal color vision. A heterozygous brown-eyed woman who is a carrier of colorblindness has children with a blue-eyed man who is not colorblind. What is the probability that their first child will be a blue-eyed female who has normal color vision? (Enter the probability as a percent. Enter the number only without the percent sign. For example, enter 100% as 100 and enter 12.5% as 12.5)
Fill in the blank(s) with the appropriate word(s).
In some molluscs, the free-swimming larva is a trochophore while in others, it is a veliger with the beginnings of a foot, shell and mantle. What is the relationship of these molluscan juvenile stages?
a. A veliger is found strictly in terrestrial molluscs b. The trochophore is considered ancestral and the veliger is a derived larval stage c. The two larval forms represent two early and distinct branches of molluscs d. The veliger is ancestral and the trochophore is a derived larval stage e. Only the cephalopods have the veliger stage; all other molluscs have a trochophore stage