Why is snail fever a common name for infections with Schistosoma?
A. The worms look like snails.
B. They are contracted by eating snails.
C. Snails are the intermediate host.
D. Physical contact with snails may result in infection.
E. The larval stage looks like a snail.
Answer: C
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The "9 + 0" cilia arrangement is associated with
A) eubacteria. B) cyanobacteria. C) cilia lining the respiratory tract. D) flagella on sperm cells. E) animal embryonic development.
What is the role of the enzyme ligase in DNA replication?
A. It matches new bases to the old strand by complementary base-pairing. B. It folds the DNA into a coiled structure. C. It unzips the double-stranded DNA. D. It seals any breaks in the sugar-phosphate backbone. E. It breaks the hydrogen bonds that hold the two strands of the DNA together.
Which of the following allows water to move much faster across cell membranes?
A) the sodium-potassium pump B) ATP C) peripheral proteins D) aquaporins
Within cells, DNA molecules are wrapped around ____ proteins to form ____ fiber, which condenses into __ during cell replication.
A. histone, chromosome, chromatin B. chromosome, chromatin, histones C. histone, chromatin, chromosomes D. chromosome, histone, chromatin