Which type of medium would be the best choice when shipping a sample of bacteria from a clinic to a laboratory for testing?
A. Blood agar
B. Eosin-methylene blue agar
C. Thioglycolate medium
D. Transport medium
Answer: D
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The poison ricin inactivates which of the following cellular organelles?
a. mitochondria b. ribosomes c. smooth ER d. Golgi bodies e. nucleus
Why do some scientists believe that RNA was the first information storage molecule?
a. because some viruses use RNA as their information storage molecule b. because RNA can be a catalyst as well as an information storage molecule c. because amino acids cannot form peptide bonds without ribosomes to catalyze their formation d. because RNA is a less stable molecule than DNA e. because proteins are made of far more amino acid monomers (over 20) than RNA (4)
Which statement BEST describes the role and importance of mobile genetic elements in genomes?
A) Mobile genetic elements almost always have either neutral or deleterious consequences for their host. B) Mobile genetic elements are largely beneficial to hosts because they introduce new phenotypic variation into a population via transposition and/or duplication of important genes. C) Mobile genetic elements can have deleterious, neutral, OR beneficial consequences for the host organism, and all three kinds of outcomes are common. D) Mobile genetic elements are especially important for plant genomes such as the tomato, but they are not present in most animal genomes.
The carrying capacity refers to the
A) minimum amount of resources needed to sustain a finite population with zero population growth. B) maximum sustainable population size for the prevailing environment. C) minimum number of individuals in a population required to assure reproductive success. D) maximum growth rate of a population in which resources are unlimited.