biomass
What will be an ideal response?
biomass consists of all the bodies of all the living things on the planet
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Poliovirus is an RNA virus of the picornavirus group, which uses its RNA as mRNA. At its end, the RNA genome has a viral protein (VPg) instead of a cap. This is followed by a nontranslated leader sequence, and then a single long protein-coding region
(~7000 nucleotides), followed by a poly-A tail. Observations were made that used radioactive amino acid analogues. Short period use of the radioactive amino acids result in labeling of only very long proteins, while longer periods of labeling result in several different short polypeptides. What conclusion is most consistent with the results of the radioactive labeling experiment? A) Host cell ribosomes only translate the viral code into short polypeptides. B) The RNA is only translated into a single long polypeptide, which is then cleaved into shorter ones. C) The RNA is translated into short polypeptides, which are subsequently assembled into large ones. D) The large radioactive polypeptides are coded by the host, whereas the short ones are coded for by the virus.
Density refers to the
a. average weight of individuals in a population. b. ability of the population to adapt to the environment. c. intelligence of the organism. d. biomass of the population of organisms. e. number of individuals per unit area.
You decide to do an experiment with isolated myofibrils to explore the effects of ATP hydrolysis on myofibril function. You do this by bathing the myofibrils in a solution that contains a modified form of ATP, which cannot be split into ADP and Pi. At what step will myofibril function be arrested by using this compound instead of unmodified ATP?
A. The myosin heads will remain attached to the actin filaments after the power stroke. B. Myosin heads will bind to the actin filaments, but the power stroke will not occur and actin filaments will not slide over the myosin filaments. C. Myosin heads will be unable to bind to the actin filaments. D. Myosin molecules will be unable to assemble into thick filaments. E. There will be no block in the cycle, since ATP hydrolysis is not required for this process.
Which of the following is NOT a characteristic of alveoli?
a. small overall surface area b. thin basement membrane c. surfactant production d. small diameter e. reduced surface tension to maintain opening