Nitrogen has a higher electronegativity than hydrogen. As a result you would expect that ammonia (NH3) molecules can form ________ with each other.
A. hydrogen bonds
B. ionic bonds
C. hydrophilic bonds
D. covalent bonds
E. cohesive bonds
Answer: A
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Which type of plant hormone is primarily responsible for inhibiting growth of lateral meristems on
shoots and restricting the formation of branches?
a. abscisic acid b. cytokinins c. auxins d. salicylic acid e. gibberellins
If you applied a drug which could prevent action potentials to a muscle cell, what would be the result when a motor neuron fired?
A. no contraction since that requires an action potential B. normal contraction C. release of calcium outside the muscle cell D. a graded potential in the neuron E. None of the answer choices is correct.
Scientists at NIH are making progress in using stem-cells to cure
a. Parkinson’s disease. b. type 2 diabetes. c. sickle-cell anemia. d. bipolar disorder. e. anorexia.
Which of the following is a purine base found in nucleotides?
a. uricil b. steroid c. guanine d. cytosine e. thymine