Question

a single-celled zygote divides many times to produce enough cells to form a multicellular organism in a process called cell
a) motility.
b) interaction.
c) proliferation.
d) differentiation.
question 15 (5 points)
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______ was a key technique used to explain the structure of dna.
a) x-ray crystallography
b) electron microscopy
c) nmr spectroscopy

Explanation:

First Question (Cell Process)

• Motility refers to cell movement, not division to form a multicellular organism.
• Interaction is about cell - cell communication or interaction with the environment, not cell division for growth.
• Proliferation means rapid cell division and growth, which is what a zygote does to produce enough cells for a multicellular organism.
• Differentiation is about cells becoming specialized in function and structure, not the initial mass production of cells from a zygote.

Second Question (DNA Structure Technique)

• X - ray crystallography was the key technique used by Rosalind Franklin, Watson, and Crick to determine the double - helix structure of DNA.
• Electron microscopy is used to view the ultrastructure of cells and organelles at high magnification, not primarily for determining DNA structure.
• NMR spectroscopy is used to study the structure and dynamics of molecules in solution, and it was not the key technique for DNA's overall structure determination.

Answer:

C) proliferation.