Imagine you have discovered a new species of bacteria. To begin your investigation of this organism, you run an assay on the total nucleotide content of the bacterial cells
If the cytosine content of DNA from the bacterial cells is 17%, what is the adenine content?
A. 17%
B. 34%
C. 66%
D. 33%
E. It is impossible to calculate this number for eukaryotes.
Answer: D
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A floodplain is an area adjacent a stream or river that experiences flooding during periods of high discharge. These ecosystems can be very rich in both quantity and diversity of organisms and can contain up to 1,000 times more species than a river. Many floodplains have been compromised by the construction of levees, pollution, and the draining of wetlands and marshes. A restoration project that focuses its efforts on the removal of levees and the improvement of water quality, is a plan focused on
A. restoration of species. B. restoration of ecosystem functioning.
Phagocytes have a pathogen-recognition system known as ________ that leads to the recognition, containment, and destruction of a pathogen
A) collagen B) fibrin C) pattern recognition receptors (PRR) D) pathogen associated molecular pattern (PAMP)
Phagocytes utilize all of the following to optimize interaction with (getting to and getting hold of) microorganisms EXCEPT
A) trapping a bacterium against a rough surface. B) opsonization. C) chemotaxis. D) lysozyme. E) complement.
Due to a mutation in the HEXA gene, a substance called GM2, normally present in the tissues and nerve cells of the brain, accumulates there. This mutation mainly effects enzymes associated with which organelle in an affected individuals' cells?
a. nucleus b. endoplasmic reticulum c. plasma membrane d. lysosomes