What group of animals is considered the most successful?
a. Echinoderms
b. Arthropods
c. Annelids
d. Molluscs
b
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One function of sphincter muscles is to
a. control the passage of food through the GI tract b. secrete digestive juices into the GI tract c. control peristalsis d. trigger hormone release e. grind large food particles
Some viruses can be crystallized and their structures analyzed. One such virus is yellow mottle virus, which infects beans. This virus has a single-stranded RNA genome containing about 6300 nucleotides. Its capsid is 25-30 nm in diameter and contains 180
If the yellow mottle virus begins its infection of a cell by using its genome as mRNA, which of the following would you expect to be able to measure? A) replication rate B) transcription rate C) translation rate D) accumulation of new ribosomes E) formation of new transcription factors
Secondary succession occurs
a. after a fire. b. on a new volcanic island. c. on bare rock. d. on land exposed as a glacier retreats e. none of these answers
Four of the following statements about mycorrhizae are true. Which one is the exception?
A. They benefit plant growth. B. They are an example of mutualism. C. They provide nutrients to their plant partner through photosynthesis. D. They increase the root surface area for absorption. E. They receive sugars from their plant partners.