In what way are vitamins and essential amino acids similar in human metabolism?
A. Both are integral parts of membrane lipids.
B. They cannot be synthesized and must be ingested.
C. Both are needed to synthesize steroid hormones.
D. They are derived from the same precursor molecules.
E. Both contain metal ions.
B. They cannot be synthesized and must be ingested.
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Which of the following pairs is mismatched?
a. microfilaments : actin b. cell membrane : phospholipid bilayer c. plant cell wall : cellulose d. chromosome : DNA e. intermediate filaments : tubulin
Tallness (T) is dominant to dwarfness (t), while red (R) flower color is dominant to white (r). The heterozygous condition results in pink (Rr) flower color. A dwarf, red snapdragon is crossed with a plant homozygous for tallness and white flowers. What are the genotype and phenotype of the F1 individuals?
A) ttRr-dwarf and pink B) ttrr-dwarf and white C) TtRr-tall and red D) TtRr-tall and pink E) TTRR-tall and red
Groups of cells that interact and provide a specific function are defined as which of the following?
A. organ system B. organ C. tissue D. tumor
Two forms of hemophilia are determined by genes on the X chromosome in humans. Assume that a phenotypically normal woman whose father had hemophilia is married to a normal man. What is the probability that their first son will have hemophilia?
A) 1/2 B) 100% C) zero D) 1/4 E) 1/3