Which of the following always tends to make chemical reactions spontaneous?
A) The reactants have lower potential energy than the products.
B) The reactants are more ordered than the products.
C) The temperature is low.
D) The pressure is low.
Answer: B
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a. brain b. heart c. muscle d. lungs e. bones
The two strands of DNA in a DNA double helix
a. are identical to each other. b. are connected to each other by covalent chemical bonds. c. both contain nucleotides, but the order of the nucleotides on the two strands is not related. d. are oriented in the same direction. e. are antiparallel to each other.
Which of the following is not a chemical group to which hormones can be assigned?
a. steroid hormones b. polysaccharide hormones c. amino acid derivatives d. peptide hormones e. fatty acid derivatives
Bryophytes lack vascular tissue and lignin and therefore cannot
A. sexually reproduce. B. grow tall. C. asexually reproduce. D. produce a gametophyte stage. E. produce a sporophyte stage.