When pressure in the lungs falls below atmospheric pressure, ____
a. oxygen leaves the blood
b. oxygen enters the blood
c. air exits the lungs
d. air flows into the lungs
e. lung volume decreases
d
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Which of the following hypotheses could be tested using microautoradiography fluorescence in situ hybridization (MAR-FISH)?
A) Bacteriorodopsin uses light energy to translocate protons. B) Archaea are the main autotrophs in marine water samples taken 300m below the surface of the ocean. C) The microbial community of agricultural soils is more phylogenetically diverse than the microbial community of native prairie soils. D) The ammonia monooxygenase gene is present in members of the phylum Verrucomicrobium.
Which important discovery in the early 1900s enhanced food production, thus increasing human population growth?
a. cultivation of rice b. cultivation of wheat c. the wheel d. synthetic fertilizer e. penicillin
Which statement best describes the mechanism(s) of posttranslational regulation of gene expression?
A. Once a protein is synthesized, there is little to no postranslational modification. B. Protein synthesis is often repressed by feedback or noncompetitive inhibition. C. Allosteric regulation following transcription of mRNA occurs in many biosynthetic pathways. D. Covalent modification of newly synthesized proteins generally has no marked effect on protein function.
Activities such as fidgeting and the maintenance of posture and muscle tone collectively lead to what is known as:
(a) non-exercise activity thermogenesis (b) non-exercise activity-induced homeostasis (c) diet-induced thermogenesis (d) the fasting phase