What is the major difference between ionic and covalent bonds?
a. Ionic bonds are reversible; covalent bonds are not.
b. Ionic bonds only occur between non-metallic elements.
c. In ionic bonds one or more electrons are transferred between atoms, whereas atoms in covalent bonds share electrons.
d. Covalent bonds only occur in the presence of radioisotopes.
c. In ionic bonds one or more electrons are transferred between atoms, whereas atoms in covalent bonds share electrons.
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Which of the following scenarios describe an ecological succession?
A. The site of a volcano eruption that is going back to its pre-eruption state B. The regrowth of a forest after a fire C. An old field left abandoned that transforms back into a forest over time D. All of the above are examples of ecological succession
Which of the following animals do not have a four-chambered heart with two separate pumping systems?
A. hummingbirds B. lizards C. cats D. crocodiles E. elephants
Diphtheria is caused by a member of which of the following genera?
A. Mycobacterium B. Corynebacterium C. Nocardia D. Propionibacterium
Legume plants with reduced amounts of leghemoglobin would be expected to
A. be unable to form a symbiosis. B. be unable to form a nodule. C. fix more nitrogen than normal legume plants. D. fix less nitrogen than normal legume plants.