Vitamin C ____.
A. helps blood to clot
B. is needed to make collagen
C. is used to create coenzymes
D. is fat soluble
E. protects cell membranes
Answer: B
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What is the name of the tubules that make up the excretory systems used by most annelids and adult mollusks?
a. hepatic tubules b. nephrons c. metanephridia d. Malpighian tubules
Which of the following statements is NOT correct about a circadian rhythm?
A. The primary usefulness of circadian rhythms seems to be to measure day-length changes so plants respond appropriately to seasonal environmental changes. B. These rhythms tend to persist even in the absence of daily light cues. C. An example is the opening of stomata in the morning and their closing at night. D. If plants are maintained in total darkness or total light, their circadian rhythm acts on a faster time scale.
Which statements about the Lake Victoria cichlid fishes are true? Check all that apply.
__X__ The adaptive radiation of the estimated 300 species of cichlid fish was very rapid and took place during the last 200,000 years. _____ The adaptive radiation of the Lake Victoria cichlids may have resulted from a key evolutionary innovation. _____ Speciation of the Lake Victoria cichlids was mainly sympatric. _____ The diversity of the Lake Victoria cichlids continues today because the lake is devoid of predators. _____ Many of the Lake Victoria cichlids have very specialized adaptations that allow them to occupy diverse habitats within the lake.
What is responsible for binding the initiator tRNA in eukaryotes?
A. eIF2 B. EF-Tu C. eIF3 D. EF-G