A housekeeping gene is one that codes for a product that:
A. functions in removing dirt from the cell.
B. is expressed differentially based on the needs of the cell.
C. is expressed at a constitutive level.
D. functions exclusively in cell membrane maintenance.
C
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How does the organization of the bacterial genome differ from the organization of the eukaryotic genome?
A. The compaction of the eukaryotic genome involves structural maintenance of chromosome (SMC) proteins, and the compaction of the bacterial genome does not. B. Most bacterial chromosomes are circular and the eukaryotic chromosomes contained in the nucleus are not. C. Bacterial chromosomes are made up of RNA and eukaryotic chromosomes are made up of DNA. D. The eukaryotic genome is found on chromosomes and there are no chromosomes in bacterial cells. E. Eukaryotic chromosomes have to be tightly packed to fit into the nucleus, and bacterial chromosomes do not require tight packing to fit into the cell.
In Chapter 2, you learned about beneficial bacteria that live on our skin and lower the pH,
which in turn keeps other disease-causing bacteria in check. This relationship between beneficial bacteria and their human hosts is an example of __________.
a. coevolution b. adaptive radiation c. sexual selection d. mutation
In autumn, the leaves of deciduous trees change colors. This is because chlorophyll is degraded and _____
A) carotenoids and other pigments are still present in the leaves B) the degraded chlorophyll changes into many other colors C) water supply to the leaves has been reduced D) sugars are sent to most of the cells of the leaves
The amount of heat energy needed to raise 1 gram of water from 14.5°C to 15.5°C is called a(n) ________.
A. thermal unit B. calorie C. joule D. erg