It is stated in Chapter 14 that "for people, an average of 2.1 children per couple results in zero population growth." Explain why it may take several generations to reach zero population once "people average" 2.1 children
What will be an ideal response?
The best responses should include a discussion of the importance of age structure and birth/death rates in determining population growth. Therefore, if the age structure of a population is such that many women are in prereproductive and/or reproductive years and they averaged 2.1 children the population can grow considerably. The population will also continue to grow if the death rate is decreased (people live longer). It may take several generations to reach zero population growth after a 2.1 child average is reached.
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What is true according to the adaptor hypothesis?
A. The anticodon and amino acid have no relationship. B. A given tRNA can carry any of the twenty amino acids. C. The position of an amino acid within a polypeptide is determined by the binding of mRNA with a tRNA carrying a specific amino acid D. An amino acid recognizes the codon in mRNA.
Antimicrobials effective against a wide variety of microbial types are termed ________.
A. semisynthetic drugs B. synthetic drugs C. narrow-spectrum drugs D. antibiotics E. broad-spectrum drugs
Which of the following is found in the general circulation?
a. lymphoid stem cells b. megakaryocytes c. platelets d. pluripotent stem cells e. myeloid stem cells
You have discovered a very small amount of DNA from an ancient organism that you want to save and study. What is the very first thing you should do to allow you to study this DNA in the lab?
A. Polymerase chain reaction (PCR) B. Gel electrophoresis C. Insert the DNA into a vector D. RT-PCR