Put the following terms in order from first to last in development.
A. zygote ? morula ? blastula ? gastrula
B. morula ? blastula ? gastrula ? zygote
C. blastula ? zygote ? gastrula ? morula
D. zygote ? morula ? gastrula ? blastula
Answer: A
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Can energy be harvested by the cells from glucose without oxygen?
A. Yes, about as much as with oxygen. B. No, oxygen is required to harvest any energy from glucose. C. Yes, but not quite as much as with oxygen. D. Yes, but much less than with oxygen.
Researchers trying to determine the genetic basis of a rare metabolic disease have been examining the pedigrees of three families affected with the disease
For all of the families, the disease is coinherited with markers on chromosome 2 and chromosome 8 . They later observe that family members show no disease if they have the defect on only chromosome 2 or on only chromosome 8 . At this point the researchers could conclude that: A. the disease is caused by defects in two or more genes on different chromosomes. B. the gene product of chromosome 2 combines with the product from chromosome 8 to form defective protein. C. family members with no disease have mutations that compensate for the defects on chromosome 2 or 8 D. the same disease can be caused by defects in single genes on different chromosomes. E. family members with the single defect have normal cellular function.
Amino acids in proteins are linked to one another by peptide bonds between the
A. methyl group of one amino acid and a side group of another amino acid. B. carbon atoms of two adjacent amino acids. C. carboxyl group of one amino acid and the amino group of another. D. nitrogen atom and carboxyl ion.
For what reason might scientists change the most current classification system?
A) if more species became extinct B) if more types of vertebrates were discovered C) if more information became available on the evolutionary history of existing species D) if new species evolved