A/an ________ allows visual inspection of the ear canal and eardrum.
A) Tympanogram
B) Tympanometer
C) Otoscope
D) Audiometer
Answer: C) Otoscope
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Which of the following features of how seedless land plants get sperm to egg are the same as for some of their algal ancestors?
A) Conjugation tubes are formed between sperm and egg cells. B) Packets of sperm are delivered by wind to the eggs. C) Aquatic invertebrates carry sperm to eggs. D) Flagellated sperm swim to the eggs in a water drop.
What is the maximum number of single covalent bonds a carbon atom (atomic number 6) can form with other elements?
A) 1 B) 2 C) 3 D) 4
The sugars in DNA and RNA ____.
A. have a different number of carbon atoms B. have the same structural formulas C. are the two components of sucrose D. have different numbers of oxygen atoms E. are disaccharides
Which statement about microarrays is false?
A) Microarrays enable scientists to determine the activity of thousands of genes at once. B) Microarrays use tiny portions of double-stranded RNA fragments from a large number of genes. C) Microarrays are used to determine which genes are active in different tissues or in tissues of different states of health. D) Microarrays use fluorescently labeled cDNA molecules to identify particular genes expressed at a particular time.