Inactivated X chromsomes form dark spots in the nucleus known as ________.
Fill in the blank(s) with the appropriate word(s).
Barr bodies
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The main form of glucose repression in the lac operon is
A. repression. B. the CAP/cAMP system. C. induction. D. inducer exclusion.
The aspect of the immune response that vaccines are based on is
A) inflammation and fever. B) stimulation of cellular, as opposed to humoral, immunity. C) stimulation of phagocytosis. D) protection of the normal microbiota. E) production of memory cells and high antibody titers from pathogen exposure.
In which of the following do the mucous membranes serve as a portal of entry for disease?
A) A pathogen crosses from the mother to the fetus by way of the placenta. B) A person rubs the eye with contaminated fingers and the pathogen is washed into the nasal cavity by way of tears. C) A person is bitten by a mosquito that carries the malaria parasite. D) Fungi digest the outer layer of the skin. E) A person receives an injection with a contaminated needle.
The fitness of an organism includes any of these behaviors except
A. behaviors associated with courtship, sexual selection, and mating. B. the set of innate behaviors in which animals respond to stimuli. C. the learned behaviors that animals develop from experience in accessing needed resources. D. the altruistic behaviors, which place an animal at additional risk for the good of others. E. an animal's behaviors that promote survival and reproductive success of itself and its kin.