Which one of the following cell types is found only in flowering plants?
A. vessels
B. tracheids
C. parenchyma
D. sieve tubes
E. epidermis
A. vessels
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The enzyme responsible for proofreading a growing DNA strand and for replacing mismatched nucleotides is
A. DNA polymerase. B. helicase. C. topoisomerase II. D. DNA ligase. E. DNA replicase.
When a foraging honeybee discovers pollen or nectar, it returns to its colony and performs a dance involving ____
signals in the complete darkness of the hive.
a. visual and acoustical b. visual and chemical c. tactile, acoustical, and chemical d. tactile, acoustical, chemical, and electrical e. visual, tactile, acoustical, chemical, and electrical
Consider the following segment of a food web: Snails and grasshoppers eat pepper plants; spiders eat grasshoppers; shrews eat snails and spiders; and owls eat shrews. The shrew occupies the trophic level(s) of __________.
a. primary consumer b. secondary consumer c. tertiary consumer d. primary and secondary consumer e. secondary and tertiary consumer
Which of the following statements concerning the hepatitis B vaccine is FALSE?
A. It must be given in three doses. B. It is protective against the virus in 95% of vaccinated individuals. C. It is recommended for high-risk groups. D. It must be repeated every five years. E. Immunity can last at least 20 years and may be for life.