A fertilized egg can develop into all the types of cells in the body and is therefore considered to be _____
a) totipotent
b) pluripotent
c) unipotent
d) multipotent
Answer: a) totipotent
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Experiments on selective adhesion demonstrated
a. ectoderm cells have positive affinity for mesoderm cells but negative affinity for endoderm cells d. ectoderm cells have positive affinity for both endoderm and mesoderm cells b. ectoderm cells have negative affinity for mesoderm cells but positive affinity for endoderm cells e. endoderm cells have positive affinity for both ectoderm and mesoderm cells c. endoderm cells have positive affinity for mesoderm cells but negative affinity for ectoderm cells
Which of the following statements is true of linkage?
A) The closer two genes are on a chromosome, the lower the probability that a crossover will occur between them. B) The observed frequency of recombination of two genes that are far apart from each other has a maximum value of 100%. C) All of the traits that Mendel studied—seed color, pod shape, flower color, and others—are due to genes linked on the same chromosome. D) Linked genes are found on different chromosomes.
A car uses the energy stored in the organic molecules of gasoline to propel the vehicle forward. In this scenario, the ____ energy in the gasoline is converted to ____ energy of motion.
Fill in the blank(s) with the appropriate word(s)
Which of the following conditions in humans is linked to bovine spongiform encephalopathy?
a. Variant Creutzfeldt-Jakob disease b. Kuru c. Gerstmann-Straussler-Scheinker syndrome d. Fatal familial insomnia