Prokaryotic DNA is found in which part of the cell?
a. The nucleoid
b. The nucleus
c. The ribosomes
d. The cell membrane
a. The nucleoid
Prokaryotic DNA is found in the nucleoid. Prokaryotes do not have a true nucleus or ribosomes.
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All living things need nitrogen. How does nitrogen enter the living portion of an ecosystem?
A. Atmospheric N2 taken in by soil bacteria B. Elemental nitrogen taken in by plant leaves C. Elemental nitrogen taken in by plant roots D. Atmospheric N2 taken in by photosynthesis
Insertions and deletions of three base pairs:
A. change one codon and, therefore, only one amino acid in the protein sequence. B. do not disrupt the reading frame so the protein ends up completely normal. C. do not disrupt the reading frame so the protein will usually retain some degree of function. D. cause frameshifts that will change the reading frame and, therefore, the sequence of the protein. E. usually result in the expression of a truncated protein.
__________ regulates the maturation of the mammary glands, and then oxytocin causes __________. Fill in the blank(s) with the appropriate word(s)
Genetic differences among species and within a species can convey genetic immunity to certain diseases.
Answer the following statement true (T) or false (F)