Which wavelengths of the electromagnetic spectrum are the only ones used for photosynthesis?
a. from about 300 to 600 nm
b. from about 400 to700 nm
c. from about 500 to 800 nm
d. from about 600 to 900 nm
Answer: b. from about 400 to700 nm
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Which of the following is the best evidence that supercoiling is an intrinsic property of double-stranded DNA molecules?
A. Strand separation during transcription and replication introduces supercoiling. B. Purified plasmid DNAs are supercoiled even though all proteins are removed. C. When two strands of an entwined rubber band are pulled apart they will twist into supercoils. D. Linear fragments of double-stranded DNA are not supercoiled. E. None of these choices is correct.
Answer the following statements true (T) or false (F)
1. Proteins can have separate domains with distinct structures and function. 2. The primary structure of a protein ultimately determines its three-dimensional structure. 3. All amino acids within a protein are either polar charged or polar uncharged. 4. The four nucleotide bases found in DNA are identical to those in RNA.
When cultured normal human cells were infected with a virus that carried the genes that coded for a
subunit of telomerase:a. the cells underwent more cell divisions than normal. b. the cells underwent fewer cell divisions than normal. c. the cells died almost immediately. d. the cells underwent gene expression more vigorously. e. the cell cycle shortened.
If the mean arterial pressure is 100 mm Hg and cardiac output is 5 liters per minute, calculate the total peripheral resistance.
a. 500 mm Hg liters min-1 b. 0.05 liters min-1 mm Hg-1 c. 20 mm Hg min liter-1 d. 5 liters per min