Which of the following statements is TRUE?
a) once a person reaches maturity, cell division stops unless it is to repair a wound
b) cell division in an adult signifies cancer
c) some specific cells throughout the body retain the ability to divide & replace themselves
d) growth continues on throughout life of an adult human
Answer: c) some specific cells throughout the body retain the ability to divide & replace themselves
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The mutation resulting in sickle-cell disease changes one base pair of DNA so that a codon now codes for a different amino acid so it is an example of a _____
A) nonsense mutation B) frameshift mutation C) silent mutation D) missense mutation
A researcher uses a probe complementary to the gene of interest and performs a colony hybridization experiment on a plate containing many bacterial colonies. Each bacterial colony contains a recombinant vector with a different piece of chromosomal DNA. What can be learned from this experiment?
A. The researcher can determine the level of expression for each gene represented. B. The researcher can identify colonies that contain the gene of interest. C. The researcher can identify colonies that have not taken up a vector. D. The researcher can determine the amount of mRNA in a specific colony. E. The researcher can determine the amount of DNA in each of the colonies.
Symptoms of heat exhaustion include all of the following except ________
a. impaired judgment b. sweating c. release of toxins into the blood d. dizziness
The nucleolus is the site of
A. protein synthesis. B. lipid synthesis. C. uncoiling and unraveling of chromosomes. D. ribosome assembly. E. chromosome replication.