The site on a chromosome where microtubules attach during cell division is the
A) chromatid. B) centromere. C) histone. D) telomere. E) locus.
B
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Which of the following best describes the physical relationship of the partners involved in lichens?
A) Fungal cells are enclosed within algal cells. B) Lichen cells are enclosed within fungal cells. C) Photosynthetic cells are surrounded by fungal hyphae. D) The fungi grow on rocks and trees and are covered by algae. E) Algal cells and fungal cells mix together without any apparent structure.
The signaling molecule involved in juxtacrine cell signaling is:
A. a small soluble peptide. B. a neurotransmitter. C. a transmembrane protein. D. a growth factor.
Proteins that act as ____________________ catalyze biochemical reactions and are vital components of the cell's metabolic pathways
Fill in the blank(s) with correct word
Which muscle contraction is involuntary?
A. cardiac only B. smooth only C. cardiac and smooth D. skeletal only E. cardiac, smooth, and skeletal