When bacteria are exposed to nutrient-poor conditions, they form thick-walled structures that contain the chromosome and a small amount of cytoplasm. These structures are called
A. plasmids.
B. pseudomonads.
C. nucleoids.
D. endospores.
E. exospores.
D. endospores.
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Answer the following statements true (T) or false (F)
1. A single pre-mRNA can be alternatively spliced into more than one type of mRNA. 2. If an acetyl group is added post-translationally to a protein, it can be subsequently removed. 3. A simple dot matrix is an efficient method to identify homologous regions of long DNA sequences. 4. DNA sequences from several different vertebrates are translated and found to contain a gene. Comparison of the sequences shows that they are 95% identical to each other. Therefore, it can be concluded that the genes are homologs. 5. Sequences that are alike will produce a horizontal line in a dot matrix analysis.
A polysome is
a. the combination of a large and a small ribosome subunit. b. the complex where mRNA splicing occurs. c. the assembly at a promoter at the start of transcription. d. an mRNA with multiple ribosomes attached. e. the complex that puts a poly(A) tail on an mRNA.
Alcids and penguins have had similar adaptations selected despite them being in different groups. What is this an example of?
a. Synchronous evolution b. Convergent evolution c. Concise evolution d. Divergent evolution
Pus is comprised of
a. dead phagocytes. b. collected cells from damaged tissue. c. excess fluid from leaky blood vessels. d. unused histamines and leukotrienes.