Orphaned organelles get lipids using chaperones.
a. true
b. false
Answer: b. false
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Which approach could be used to investigate distinctions between a muscle cell and a bone cell?
A) Gene expression profiling B) DNA variation screening C) Microarray comparative genomic hybridization D) Transcription-mediated amplification
Which of the following statements about the fast block to polyspermy is FALSE?
a. It occurs within seconds after fertilization. b. It involves a wave of electrical depolarization that spreads over the egg surface. c. It is not mediated by Ca2+ ions. d. It is more pronounced in vertebrates than in invertebrates. e. It is more pronounced in invertebrates than in vertebrates.
Which of the following is NOT true of ecosystems?
a. Although they may include many different species, many features of ecosystem structure and function are alike. b. Autotrophs secure energy and nutrients that are then used by heterotrophs. c. Energy cycles and minerals flow through ecosystems. d. Many different food chains are represented in most ecosystems. e. Ecosystems are characterized by relatively few trophic levels
The organisms occupying the base of a pyramid of energy are autotrophs
____________________ Indicate whether the statement is true or false.