The above figure represents which of the
following chromosomal changes:a.
inversion
b. deletion
c. duplication
d. translocation
e. aneuploidy
A
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The functioning of enhancers is an example of _____
A) transcriptional control of gene expression B) a post-transcriptional mechanism to regulate mRNA C) the stimulation of translation by initiation factors D) post-translational control that activates certain proteins E) a eukaryotic equivalent of prokaryotic promoter functioning
Heterotrophic bacteria are able to break down large food items
a. by ingesting them with pseudopods. b. with exoenzymes. c. by breaking them up with cilia. d. by crushing with their larger relative size. e. by using their cell membranes to pinch the food into smaller pieces.
One technique for staining bacteria for viewing under the microscope is called the Gram stain. In this technique, alcohol is used as a decolorizer because it degrades the outer membrane found in some bacteria. What chemical component of the cell does alcohol affect?
A. Nucleic acids B. Carbohydrate C. Lipid D. Protein
Which of the following statements about non-coding DNA is TRUE?
The role of non-coding DNA is understood to be extra genes that only get turned on in situations where the regular genes become damaged. Non-coding DNA can only occur between genes, not within genes themselves. "Junk DNA" refers to the proportion of base sequences in DNA that do not code for anything and seem to have no obvious purpose. Bacteria have the most non-coding DNA; more than 90% of their genome contains introns. Fruit flies are one of few organisms to have less coding DNA than humans.