At least some of the cells of a mammalian heart in the final phase of development would most likely be
A. expressing segmentation genes.
B. either undergoing apoptosis or expressing cardiac-specific transcription factors.
C. expressing cardiac-specific transcription factors.
D. undergoing apoptosis.
E. dividing rapidly.
Answer: B
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Bacterial proteins were radioactively labeled and fed to phagocytic cells. The proteins within the phagocytic cell became increasingly more radioactive over time. This observation is the result of the activity of
A) mitochondria. B) chloroplasts. C) lysosomes. D) peroxisomes. E) the Golgi apparatus.
A muscle contraction that shortens the muscle to move a load is
a. isometric. b. isotonic. c. eccentric. d. heliocentric. e. dynamic.
Which term refers to a mutualistic symbiosis where fungal hyphae penetrate plant root cells?
a. an ectomycorrhiza b. an arbuscular mycorrhiza c. a lichen d. a haustorium
Refer to the paragraph on how caterpillar-damaged plants protect themselves by attracting parasitic wasps. What can you conclude based only on the information in the preceding paragraph?
A) The attracting terpenoid compounds are always present in the corn seedling. B) Physical injury by the caterpillar mouthparts results in the immediate release of terpenoids. C) Chemical signals from the caterpillar saliva attract the parasitic wasp. D) The parasitoid wasp is attracted by compounds produced by an injured corn plant.