Which of the following most accurately describes selective permeability?
A) An input of energy is required for transport.
B) Lipid-soluble molecules pass through a membrane.
C) There must be a concentration gradient for molecules to pass through a membrane.
D) Only certain molecules can cross a cell membrane.
D
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How many protons are in the nucleus of a
phosphorus atom?
a. 5 b. 7 c. 10 d. 15 e. 30
DNA is negatively charged because of its
A) deoxyribose molecules. B) ribose molecules. C) phosphate groups. D) bases. E) large molecular size.
During development in the mother's uterus, human embryos have pharyngeal pouches (sometimes called gill slits) that later develop into various glands. Fish also have pharyngeal pouches as embryos, but these develop into gills. The best explanation for why human and fish embryos develop pharyngeal pouches is
A. fish evolved from humans. B. humans and fish both develop pharyngeal pouches by random chance. C. humans and fish share a common ancestor that had gills. D. human embryos need gill slits to breathe in the uterus.
Members of the supergroup Amoebozoa are characterized by:
A. plastids acquired through tertiary endosymbiosis B. hard shells composed of calcium carbonate C. locomotion via pseudopodia D. alveoli beneath the plasma membrane E. the presence of a feeding groove