Changes in an organism that are the result of changes in gene action(s) are known as
A) diseases.
B) epigenetic.
C) silencing.
D) micro-RNA mediated.
E) all of the above
B) epigenetic.
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Which of the following statements about plasma membranes is INCORRECT?
A. They are composed of phospholipids. B. They have both integral and peripheral proteins. C. They are relatively rigid structures. D. They are composed of two leaflets of phospholipids. E. They function to separate the extracellular and intracellular environment.
Distances on genetic maps are measured in ____________________ and distances on physical maps are measured in ____________________
Fill in the blank(s) with correct word
A microbiologist inoculates Staphylococcus aureus into a culture medium. Following incubation, both Staphylococcus aureus and Staphylococcus epidermidis are determined to be growing in this culture. What is the most likely explanation?
A. The culture was contaminated. B. The culture medium was differential. C. The incubation temperature was incorrect. D. The microbiologist used too much inoculum. E. The culture medium was selective.
Which of the following statements about the immune system is correct?
a. Memory cells are involved in a primary immune response. b. Dendritic cells were first identified in the nervous system. c. Interferons are specific proteins that block cell replication at the level of mitosis. d. Natural killer cells are involved in both specific and nonspecific immune responses. e. Defensins are one type of protective protein synthesized by T helper cells.