B cells and T cells make up which part of the immune system?
a. natural immune system
b. acquired immune system
c. adaptive immune system
d. innate immune system
c. adaptive immune system
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During the lag phase of microbial growth, the cells are metabolically inactive.
Answer the following statement true (T) or false (F)
Due to well developed molecular tools and careful screening designs, functional genes can be isolated directly by isolation from the environment rather than cultivating the diverse species in a microbial community
Indicate whether the statement is true or false.
The nucleotides called pyrimidines include
A. uracil and cytosine. B. uracil and thymine. C. thymine and cytosine. D. thymine and adenine. E. cytosine and guanine.
In 1932, researchers Emerson and Arnold showed that the rate of photosynthesis saturated at a lower light intensity than expected for the number of individual chlorophyll molecules. From this observation they determined
A. that pigments were clustered in photosystems and they were measuring saturation of pigments in reaction centers. B. that high light intensities destroyed most pigment molecules. C. that they had overestimated the number of chlorophyll molecules present in their test organism. D. that plants must be able to fix carbon before their pigments can absorb light.