The average life span of a red blood cell is approximately
A. 15 days.
B. 4 months.
C. 1 month.
D. 2 months.
E. 6 months.
Answer: B
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Indicate whether the statement is true or false.
Answer the following statements true (T) or false (F)
1. A single gene always encodes an enzyme. 2. RNA polymerase II of eukaryotes always requires more than one general transcription factor to initiate transcription. 3 The molecule mRNA, which contains the information to make a polypeptide, is constructed from a DNA template. 4. As part of the transcriptional unit, regulatory sequences are the sites where RNA polymerase and transcription factors bind to regulate transcription.
Water is capable of rising to the tops of the tallest trees due to the:
a. chemical bonds of water molecules. b. push of gravity. c. adhesion of water molecules to each other. d. push of ground water. e. pull of transpiration
Which of the following statements regarding the currently available fossil record is false?
A) The currently available fossil record shows that the earliest fossils of life are about 3.5 billion years old. B) The currently available fossil record shows that younger strata were laid down on top of older strata. C) The currently available fossil record documents gradual evolutionary changes that link one group of organisms to another. D) The currently available fossil record shows that the first life-forms were eukaryotes.