The initial skeleton of all vertebrate embryos is made
of
a. cartilage.
b. collagen.
c. compact bone.
d. spongy bone.
e. fibrous proteins.
Answer: a
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A fragile site
a. is found only on the X chromosome. b. occurs in only one of the sister chromatids. c. is associated with cancerous cells. d. is usually not inherited. e. is the result of genomic imprinting
What best describes all of the alleles for all the loci present in a population?
a. gene pool b. allele collection c. population variation d. evolutionary potential e. population compilation
In a wild-type strain of fruit flies, the length of a gene from the start to the stop codon is 2,000 DNA bases. Suppose an experiment indicated that the mRNA molecule transcribed from this gene is much shorter (only 1,200 bases)
What is the most likely explanation for this? A) There are introns in the DNA that were cut out of the mRNA. B) The mRNA was prematurely degraded. C) A mutation caused the formation of an extra stop codon in the gene. D) The first 800 bases of DNA are always cut out as it is transcribed into mRNA.
The energy needed to destabilize existing chemical bonds and start a chemical reaction is called
A. kinetic energy. B. potential energy. C. free energy. D. activation energy.