Rank the elements carbon, phosphorus, calcium, and iodine in order of decreasing number of protons
A. CPCaI
B. ICaPC
C. IPCCa
Answer: B
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Which of the following is NOT involved in nitrogen
fixation? a. breaking triple bonds b. production of NH3 c. production of NO3– d. production of NH4+ e. All of these are involved in nitrogen fixation
Which of the following organs of the endocrine system secretes melatonin?
a. pituitary gland b. pancreas c. pineal gland d. adrenal glands e. thyroid gland
Opening of the stomata:a
occurs during prolonged periods of drought. b. occurs when there is a high concentration of carbon dioxide in the leaf. c. is under hormonal control. d. is triggered by darkness. e. is controlled by the changes in shape of the companion cells.
Recombinant DNA refers to the
A) study of bacterial ribosomes. B) study of the function of genes. C) interaction between human and bacterial cells. D) synthesis of proteins from genes. E) DNA resulting when genes from one organism are inserted into another organism.