Choose the true statement about genome size and gene number in animals.
A. There is a strong correlation between the number of genes and genome size.
B. Much of the extra DNA in humans is in the form of exons.
C. The pufferfish has a larger genome than humans and more genes.
D. Genome size differences depend to a large extent on the amount of retrotransposon DNA present.
D. Genome size differences depend to a large extent on the amount of retrotransposon DNA present.
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Which of the following structural motifs found in transcriptional regulators is the least likely to require an inverted repeat for binding to DNA?
A. helix-turn-helix B. homeodomain C. leucine zipper D. zinc finger
Spirilli are Gram-negative bacteria that possess internal flagella, which cause the entire cell to twist in a corkscrew
pattern.
Indicate whether the statement is true or false.A vaccine made from genetically engineered viruses is the basis for immunity against ____
a. small pox b. polio c. tetanus d. influenza e. cholera
When a plant cell, such as one from a peony stem, is submerged in a very hypotonic solution, what is likely to occur?
a) the cell will become flaccid b) the cell membrane will lyse c) plasmolysis will shrink the interior d) the cell will burst e) the cell will become turgid