When muscle cells are stimulated at such rapid rates that there is no relaxation between contractions, a greater force is produced. This property of muscle contraction is called:
A. hyperpolarization.
B. summation
C. tetanus
D. agonist
B
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There is more diversity in heavy chains resulting from combinatorial joining than is seen in light chains.
Answer the following statement true (T) or false (F)
How do anoxygenic phototrophs benefit from possessing accessory pigments that allow light to be harvested at deeper areas of a fluid environment?
A. This allows even anaerobic microbes to conduct photosynthesis, as they can harvest light energy in the deeper areas where oxygen won't be present. B. The cells can use wavelengths of light that havenotbeen absorbed (filtered out) by the photosynthetic organisms closer to the surface of the fluid. C. They don't have to compete with other cells that utilize oxygen in the upper levels for the scarce nutrients in the fluid environment. D. This allows even anaerobic microbes to conduct photosynthesis, as they can harvest light energy in the deeper areas where oxygen won't be present AND can use wavelengths of light not absorbed (filtered out) by the photosynthetic organisms closer to the surface of the fluid. E. This allows even anaerobic microbes to conduct photosynthesis, as they can harvest light energy in the deeper areas where oxygen won't be present, use wavelengths of light not absorbed (filtered out) by the photosynthetic organisms closer to the surface of the fluid; AND don't have to compete with other cells that utilize oxygen in the upper levels for the scarce nutrients in the fluid environment.
Identify the incorrect statement from below
A. Donor (TetR) and Recipient (StrepR) grow only on those antibiotic plates to which they are resistant. B. Donor and Recipient being sensitive to Streptomycin and Tetracycline respectively will not grow on those antibiotic plates. C. Both parental strains do not grow on the double antibiotic plate as it contains one or the other antibiotic to which they are sensitive. D. There is no gene transfer of antibiotic resistance from F factor of donor to recipient. E. A bacterial lawn is also seen on plating conjugated sample on the individual antibiotic plates.
A student set up an experiment to test if plants give off water vapor. Fifty pea plants, growing in pots, were covered with individual glass containers and left overnight. The next morning, the inside of each lid was covered in droplets of water. The lab student concluded that plants generally give off water vapor. What critique would you make of the experimental design?
A. The student did not have a clearly stated hypothesis before beginning the experiment. B. There was no control so the water could have come from other sources such as air in the jar or the soil. C. The experiment was not precise, meaning it was not reproducible. D. There was not a large enough sample of pea plants used to get adequate data.