When several ribosomes translate the same mRNA they are called ________
a. polysomes
b. polypeptides
c. codons
d. mutations
e. polysaccharides
a
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The habitats of "birds of paradise" in New Guinea are on mountains separated by
a. areas of unsuitable land. b. fierce predators. c. man-made borders. d. the ocean. e. rivers and lakes.
The seminal vesicles secrete:a
fructose, which nourishes the developing embryo. b. a basic fluid, which neutralizes the acidic environment of the vagina. c. mucus, which lubricates the penis. d. sperm, which fertilize the ovum. e. prostaglandins, which stimulate contraction of the uterus.
Which of the following statements concerning tetanus is FALSE?
A) Its only source is from deep puncture wounds from rusty nails. B) Its toxin causes simultaneous contraction of both muscles in an antagonistic pair. C) It is a small, motile, obligate anaerobe. D) It produces a terminal endospore that gives the cell a distinctive "lollipop" appearance. E) Its diagnostic feature is characteristic muscle contractions, which are often noted too late to save the patient.
The concept that living organisms arise from nonliving material is called ________.
A. cell theory B. germ theory C. spontaneous generation D. biogenesis