Which health problem(s) are due to environmental factors?
A. Spina bifida
B. Fetal alcohol syndrome
C. Down syndrome
D. Spina bifida and fetal alcohol syndrome
E. Fetal alcohol syndrome and Down syndrome
D. Spina bifida and fetal alcohol syndrome
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What type of interaction is directly responsible for the formation of secondary structure?
A) peptide bonds between adjacent amino acids B) peptide bonds between nonadjacent amino acids C) hydrogen bonds between sections of the polypeptide backbone D) hydrogen bonds between side chains of amino acids
The interior of a neuron is more negative than the outside due to the presence of:
A. proteins. B. hydroxyl (OH–) groups. C. chloride ions. D. both proteins and chloride ions.
Enzymes are a type a _____, which reduces the activation energy of a chemical reaction.
Fill in the blank(s) with the appropriate word(s).
Why can some plants be cloned from a single cell?
A) Plant cells do not differentiate even when mature, so any cell can grow into an entire plant. B) Plant cells can dedifferentiate and give rise to all of the specialized cells required to produce an entire plant. C) Plant cells can produce genes to replace those lost during development. D) Plant cells are capable of self-renewal by utilizing cellular components from adjacent cells.