What percentage of carbon's orbitals are spherical in conformation?

A. 0% B. 20% C. 40% D. 80% E. 100%


Answer: C

Biology & Microbiology

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Four of the five answers listed below are barriers to invasion. Select the exception

a. intact skin b. mucous membrane c. gastric juices d. blood plasma e. lysozyme

Biology & Microbiology

Which of the following is a hormone that regulates the reabsorption of sodium by the distal convoluted tubules and collecting ducts?

A) aldosterone B) ANP C) angiotensin D) ADH

Biology & Microbiology

Some microbes secrete small molecules that induce other microbes to settle nearby. When a certain number of individuals have assembled, the chemical signal is strong enough to induce the aggregation to respond collectively to stimuli. This process is called

A. quorum sensing B. mass-settling C. conjugation D. bioremediation E. mutualism

Biology & Microbiology

Which one of the following hormones is incorrectly paired with its site of production?

a. Releasing hormones - hypothalamus b. Growth hormone - anterior pituitary c. TSH - thyroid d. Estrogens and progestins - ovary e. Epinephrine - adrenal glan

Biology & Microbiology