The DNA of a cell is found mainly in its __________.
Answer(s): D
Chromosomes are composed of DNA and protein and are usually found in the nucleus.
Most cells without a cell wall also lack __________.
Answer(s): B
The cell wall, mainly composed of cellulose, is an important characteristic of plant cells. Chloroplasts contain energy-accumulating pigments and are found only in plant cells.
The cells that can easily be scraped from the lining of the mouth make up __________.
Epithelial cells form the skin and inner lining for organs.
The ___________ of an isotope is the time in which it takes half of an initial amount of an isotope to decay into something else.
The half-life of an isotope is the time in which it takes half of an initial amount of an isotope to decay into something else.
The end produces of protein digestion consists of __________.
Proteins are synthesized from a variety of amino acid "building blocks." Digestion breaks down the complex protein structures.
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