Which of the following describes the blood-brain barrier?
A) It is part of the immune system that involves the release of antibodies to protect the brain from infectious agents
B) It is a property of the closely packed endothelial cells of the walls of brain capillaries that prevents large molecules from entering the brain
C) It is a property of blood vessels of the brain that promotes the diffusion of nutrients into the tissue of the brain
D) It is a property of neurons that prevents them from accidentally releasing their neurotransmitters in to the blood circulation
Answer: B) It is a property of the closely packed endothelial cells of the walls of brain capillaries that prevents large molecules from entering the brain
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The disinfectant screening method that is known as the ________ test, which is used to measure the potency of a disinfectant.
Fill in the blank(s) with the appropriate word(s).
During inhalation
a. the pressure in the thoracic cavity is greater than the pressure within the lungs. b. the pressure in the alveoli is less than the atmospheric pressure. c. the diaphragm moves upward and becomes more concave. d. the chest cavity volume decreases. e. all of these occur.
The iron-response element (IRE) is a(n)
A) insulator element that binds IRE-binding protein in the absence of iron. B) transcriptional promoter that directly binds iron to prevent transcription of nearby genes. C) long noncoding RNA that binds iron and regulates transcription of multiple genes. D) sequence in the 5? untranslated region of mRNA that forms a hairpin loop, preventing translation of the mRNA by binding to IRE-binding protein in the absence of iron. E) example of a prokaryotic riboswitch that causes early termination of transcription in the presence of iron.
The only situation in which a person can survive without one of a pair of chromosomes is:
a. There is no situation in which a person can survive without one of a pair of chromosomes. b. "Super males," Y_, in which a male has only one sex chromosome. c. "Metafemales," X_, in which a female has only one sex chromosome. d. Turner syndrome, X_, in which a female has only one sex chromosome. e. Monosomy 21, in which a person has only one copy of chromosome 21.