What is the term that describes the complex of DNA and proteins that makes up a eukaryotic chromosome?
a. centriole
b. centrosome
c. chromatin
d. centromere
Ans: c. chromatin
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Dry heat methods usually require lower temperatures and shorter exposure times than moist heat methods to achieve the same degree of killing because of the drying effects of this form of heat.
Answer the following statement true (T) or false (F)
_______ inject their genetic material into a cell, leaving their capsid in the extracellular space.
a. RNA viruses b. DNA viruses c. Virions d. Bacteriophages
Annual rings in a tree trunk result from
A. the alternation of xylem and phloem produced in one year. B. the proportion of wood cells and cork cells in the xylem. C. deposition of colored materials in the oldest cells. D. the kinds of cells, parenchyma or sclerenchyma, produced by the cambium. E. the variation in cell size due to different growth conditions throughout a year.
The molecule below
A. was probably produced by a plant.
B. is liquid at room temperature.
C. was formed by three separate hydrolysis reactions.
D. contains more energy per gram than a carbohydrate.