Diffusion of materials from outside to the middle of a cell depends upon
A. the thickness of the cell membrane.
B. the distance from the surface to the middle of the cell.
C. the age of the cell.
D. osmosis.
B. the distance from the surface to the middle of the cell.
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Which scientists are credited for deducing the true structure of DNA?
A. Rosalind Franklin B. Erwin Chargaff and Oswald Avery C. Martha Chase and Frederick Griffith D. James Watson and Francis Crick
Sclereids are cells that:a
are found in wood and bark. b. conduct water and dissolved minerals. c. are usually found in nut shells and pits of stone fruits. d. conduct dissolved sugars. e. form cytoplasmic connections between cells.
Which term refers to groups of cells that share a common structure and function?
a. organ systems b. organs c. tissues d. colonies
Codons are _____ of mRNA that specify different _____.
A) nuclei, DNA B) proteins, genes C) base triplets, amino acids D) polypeptides, proteins