The hereditary material present in all cells is
A) protein. B) RNA. C) R-strain. D) DNA. E) S-strain.
D
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To attach a particular amino acid to the tRNA molecule that will transport it, an enzyme, an aminoacyl-tRNA synthetase, is required, along with ATP. Initially, the enzyme has an active site for ATP and another for the amino acid
, but it is not able to attach the tRNA. What must occur for the final attachment to occur? A) The ATP must first have to attach to the tRNA. B) The binding of the first two molecules must cause a 3-D change that opens another active site on the enzyme. C) The ATP must be hydrolyzed to allow the amino acid to bind to the synthetase. D) The tRNA molecule must alter its shape to be able to fit into the active site with the other two molecules. E) The end of the tRNA must be cleaved before it can have an attached amino acid.
Which type of blood cell is produced from lymphoid stem cells?
a. basophils b. B lymphocytes c. eosinophils d. erythrocytes e. neutrophils
In the absence of dietary carbohydrates, bacteria do not cause tooth decay.
Answer the following statement true (T) or false (F)
Nervous tissue is composed of two types of cells: ________ that conduct impulses and ________ that surround and protect these cells
Fill in the blank(s) with correct word