What is an amphipathic molecule. Give an example
A. A molecule that contains quaternary structure such as PROTEINS.
B. (4) A molecule that is hold together by hydrophobic interactions such as PROTEINS
C. A molecule that contains hydrophobic groups such as LIPIDS
D. A molecule that contains both hydrophobic and hydrophilic groups such as LIPIDS.
E. A molecule that contains both hydrophobic and hydrophilic groups such as POLYSACCHARIDES.
Ans: D. A molecule that contains both hydrophobic and hydrophilic groups such as LIPIDS.
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The receptors for steroid hormones are located inside the cell instead of on the membrane surface like most other signal receptors. This is not a problem for steroids because _____
A) the receptors can be readily stimulated to exit and relocate on the membrane surface B) steroids do not directly affect cells but instead alter the chemistry of blood plasma C) steroid hormones are lipid soluble, so they can readily diffuse through the lipid bilayer of the cell membrane D) steroids must first bond to a steroid activator, forming a complex that then binds to the cell surface
Which domain of life contains the most multicellular organisms?
A. Archaea. B. Bacteria. C. Prokarya. D. Eukarya. E. microorganisms.
Bacterial classification utilizes cladograms whereas identification uses
A) DNA sequencing B) genetic mapping C) relationship measurements D) dichotomous keys
____ are NOT composed of microtubules.
A. Cilia B. Flagella C. Chromosomes D. Centrioles