Radiation in the environment that contributes to radiation exposure is called ____________________ radiation. Fill in the blank(s) with the appropriate word(s)
background
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Passive immunity provided to newborns through the placenta belong to the _____ class of immunoglobulins.
What will be an ideal response?
The gene that encodes small-subunit ribosomal RNA is useful for reconstructing the phylogeny of all organisms, because ________
A) the gene is subject to strong stabilizing selection B) the gene's function has stayed unchanged in all organisms C) all organisms have ribosomes with similar composition and structure D) all organisms have the gene E) All of the above.
With negative pressure breathing, the muscles that move the ribs and diaphragm are distant from the absorptive alveolar surfaces. What difficulty(ies) could occur if the muscles were around each alveolus and had to expand each alveolus to suck in air?
A. Interspersed muscle tissue would take up much space and the lung-muscle volume would have to be much larger. B. Adding a third tissue to the intimate alveolar-capillary complex would increase the problems with disorders and diseases. C. Muscle tissue would get in the way of absorption of gases across the air-to-capillary border. D. Since muscle cells only contract and relax, it would be difficult for a few cells to cause alveolar expansion. E. All of the choices are correct.
Which of the following does not occur when a muscle fatigues?
A. The muscle relaxes. B. Stimulation continues. C. Its energy reserves are depleted. D. Acetylcholine is crossing the synaptic cleft. E. Tetanus is achieved.