The principle behind salt or sugar preservation is to
A) introduce a mechanical barrier to microbial invasion.
B) reduce water activity (aw).
C) introduce a microbicide in anticipation of contaminating bacteria or fungi.
D) accomplish all of the described functions depending on the food being preserved.
Answer: B
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When one plant is shaded by another, why is the ratio of far-red to red light increased compared to an unshaded plant?
A. Phytochrome in the taller plant absorbs most of the red light. B. Auxin absorbs mostly far-red light. C. As light passes through the leaves of the taller plant, most of the red light is absorbed by chlorophyll. D. Far-red light mostly reflects off the surface of the soil while red light is mostly absorbed. E. Shade is enriched in far-red wavelengths of light.
What does DNA ligase do?
a. breaks the hydrogen bonds between base pairs b. seals gaps between assembled nucleotides c. provides energy for nucleotide assembly d. acts as an initiator to start the replication process e. seals the ends of the replicated DNA molecule
What types of membrane proteins catalyze reactions in the extracellular fluid or within the cell?
a. receptor proteins b. channel proteins c. recognition proteins d. enzymes
Hormones are typically involved in maintaining ____ , or a given steady state for a particular factor (like sugar or calcium levels in the blood)
Fill in the blank with the appropriate word.