In 1942 a scientist testing part of a radar system discovered that a candy bar in his pocket had melted. Intrigued, he tried placing an egg near the system he was working on; it exploded and splattered him with hot egg. In this way it was discovered that
part of the radar system could be used to cook foods, which led to the development of the microwave oven. When this kind of repurposing occurs in biological systems, it is called
A) paedomorphosis.
B) mutation.
C) exaptation.
D) adaptive radiation.
Answer: C
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Which of the following areas of the human body is(are) not normally free of microorganisms?
A. Intestinal tract B. Eyes C. Respiratory tract D. All of the choices are correct.
Which of the following answers lists the steps of aerobic cellular respiration in the correct sequence?
A. photosystem II - electron transport chain - photosystem I - carbon reactions B. glycolysis - electron transport chain - Krebs cycle - formation of acetyl CoA - chemiosmotic phosphorylation C. glycolysis - formation of acetyl CoA - Krebs cycle - electron transport chain - chemiosmotic phosphorylation D. chemiosmotic phosphorylation - formation of acetyl CoA - glycolysis - Krebs cycle - electron transport chain E. glycolysis - formation of acetyl CoA - chemiosmotic phosphorylation - Krebs cycle - electron transport chain
Genes located close together on the same chromosomes are referred to as ________ genes and generally ________
A) linked; sort independently during meiosis B) homologous; are inherited together C) linked; do not sort independently during meiosis D) codependent; do not sort independently during meiosis
A(n) ________ is a regulatory molecule that is secreted into the blood by an endocrine gland.
A. G protein B. antibody C. enzyme D. hormone E. neurotransmitter