Which of the following is a difference between weak chemical bonds and covalent or ionic bonds?
A. Weak chemicals bonds are harder to break.
B. Weak chemical bonds are shorter than covalent or ionic bonds.
C. Weak chemical bonds are transient compared to covalent and ionic bonds.
D. Weak chemical bonds are not particularly useful in biological systems.
E. Weak chemical bonds require more energy to break than covalent and ionic bonds.
C
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Which of the cell adhesion molecules is critical to transducing changes in the ECM to a change in the cell?
A. connexins B. cadherins C. integrins D. fibronectins E. claudins
Caldarchaeol lipids are extremely thermostable tetraethers found in many ________.
A. hypersalinic archaea B. autotrophic archaea C. psychrophile archaea D. hyperthermophilic archaea
Alternative forms of a gene (such as those responsible for eye color) are called
A) cyclins. B) alleles. C) receptors. D) sister chromatids. E) telomeres.
Matthias Schleiden was a German botanist (plant scientist) and co-founder of cell theory, along with the physiologist Theodor Schwann. Schleiden determined that all the tissues of all the plants he studied were composed of cells, and Schwann discovered the same was true of all the animal tissues he studied. Together they concluded which of the following statements was true?
A. That plants, but not animals, are composed entirely of cells. B. That animals, but not plants, are composed entirely of cells. C. That some plants and animals are composed of cells. D. That all plants and animals are composed of cells.