Basal metabolic rate is a measure of the energy required
A. during strenuous exercise.
B. at rest.
C. during normal daily activities.
D. at birth.
B. at rest.
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Which of the following statements is false?
A. Differentiation of distinct cell types was a key step in the evolution of complex multicellularity. B. Complex multicellularity involves differentiation in space instead of time. C. Unicellular organisms can have life cycles where different cell types alternate in time. D. Distinct cell fates are achieved by switching on and off different combinations of genes in different cells. E. Gradients of environmental signals trigger differentiation of cells.
The plant hormone ____ is primarily responsible for the bending of a plant shoot toward light
a. auxin b. ethylene c. systemin d. salicylic acid e. brassinosteroid
The transforming principle that Griffith described from his work with Streptococcus pneumoniae
bacteria turned out to be ____.
a. a polysaccharide capsule b. a phospholipid c. protein d. RNA e. DNA
What do Riftia worms lack that makes them different than other worms?
a. A circulatory system b. An excretory system c. A digestive system d. A nervous system