Pepsin is a digestive enzyme that _____
A) is manufactured by the pancreas
B) helps stabilize fat-water emulsions
C) splits maltose into monosaccharides
D) begins the hydrolysis of proteins in the stomach
E) is denatured and rendered inactive in solutions with low pH
Answer: D
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The process by which food is broken down and absorbed through the lining of the gastrointestinal tract
What will be an ideal response?
A population in which death rates are higher than birth rates, and the prereproductive group is smaller than the reproductive group, is best represented by an age structure diagram with a(n) ________-shape.
A. pyramid B. urn C. S D. bell E. J
Why does an embryo with a balanced translocation have the same chance for normal development that an embryo with a normal karyotype has?
A. The translocation stimulates DNA repair mechanisms to correct the problem before commitment occurs. B. The embryo's somatic cells are unaffected, expressing a normal karyotype; only germline cells express the translocation. C. Although the location of the genetic material is abnormal with a balanced translocation, there are no missing or extra alleles. D. When a zygote with a balanced translocation reaches the embryo stage without a spontaneous abortion, the risk for abnormal development decreases.
There is a color pattern inherited in certain mice in which agouti (gray) is homozygous, and yellow is
heterozygous. A cross of two yellows produces two yellows for each agouti. A second gene, C/c, controls the expression of the color genes: C is the dominant allele that allows color to be expressed, and the recessive gene in the homozygous condition (cc) prevents any color from being expressed. (a) Give the genotypes of a white parent crossed with a yellow parent that produces 1/2 white, 1/3 yellow, 1/6 agouti offspring. (b) Give the results of the cross of two forms heterozygous for each gene. (c) Can you develop a pure-breed population for any of the colors? What will be an ideal response?