Why would soil and water be added to a compost pile?
A. The organisms in the soil, along with the moisture from the water, would facilitate the natural decomposition of the material in the compost pile.
B. Without adding soil and water, no decomposition of the material can take place. The material would simply sit there.
C. Water is the medium that photosynthetic organisms use to break down the organic materials in the compost pile.
D. Soil spreads out the material in the pile. If the material is too close together, natural aeration cannot occur and decomposition stops.
A.
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Which of the following choices CORRECTLY ranks by the routes of water loss from largest source of water loss to smallest source of water loss, by their average volume?
A. urine, skin, feces, lungs B. urine, skin, lungs, feces, C. urine, feces, skin, lungs D. skin, urine, lungs, feces
A nucleolus is
A) the area in a prokaryote where DNA is concentrated. B) an extra nucleus in the cell. C) an area in the nucleus of eukaryotic cells where ribosomes are synthesized and assembled. D) a membrane-bound organelle. E) an area where the nucleus is synthesized.
It is possible for a repressor to negatively regulate the expression of an operon because:
A. the repressor-binding site on the DNA overlaps with the translation start site, thereby preventing the transcription. B. the repressor physically blocks where the activator should be binding on the operator region. C. one of the structural genes expressed in the operon negatively regulates the repressor. D. the repressor-binding site overlaps the promoter site of the operon, allowing it to physically block the binding of RNA polymerase. E. the repressor induces the expression of the inducer by binding to the promoter that comes before the inducer gene.
A cell performs its normal activities, grows in size, and makes copies of its organelles during _______.
a) prophase b) anaphase c) interphase d) metaphase e) telophase