Which organ releases hormones that assist with the development of the immune system and continues to shrink as an individual matures and ages?
a. thymus
b. thyroid
c. thalamus
d. testes
a. thymus
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Integration of linear transforming DNA into the chromosome
A) is not required for the expression for the transformed genes. B) is catalyzed by the RecA gene. C) almost never occurs because restriction endonuclease will degrade the DNA before it is integrated. D) only occurs in laboratory-based systems in artificial competent cells.
Chromosome number is reduced during meiosis because the process consists of
a. two cell divisions without any chromosome replication. b. a single cell division without any chromosome replication. c. two cell divisions in which half of the chromosomes are destroyed. d. two cell divisions and only a single round of chromosome replication. e. four cell divisions with no chromosome replication.
Which method of gene transfer involves direct contact between the bacteria?
a. Conjugation. b. Transformation. c. Transduction.
Which of the following items are typically irradiated in order to kill microbes?
A. operating room air B. surgical gloves C. human tissues such as heart valves and skin D. ground beef and other meat and poultry E. All of these choices are correct.