Plant cells, unlike animal cells, are characterized by the presence of a ________
A) cell wall and a contractile vacuole
B) cell wall and a central vacuole
C) nucleus and a cell wall
D) nucleus and a contractile vacuole
B
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The Ti plasmid is a natural plasmid in the soil bacterium Agrobacterium tumefaciens
Indicate whether the statement is true or false
Gigantism is caused by hypersecretion of ________ hormone during childhood and adolescence
Fill in the blank(s) with correct word
When a honey bee scout returns to the hive, it will perform a round dance to indicate that the nectar is
close, while the waggle dance indicates the nectar is distant to the hive. This dance is an example of: a. sign stimuli linked to social interaction. b. migratory behavior stimulated by environmental changes. c. insight learning based on trial and error. d. a physiologically meaningful stimulus (food) and an irrelevant stimulus (dance). e. optimal foraging dependent on cooperative social behavior.
The diagram shows the rate of diffusion into a cell using carrier proteins. 
McGraw-Hill EducationCarrier proteins are saturated at which point?
A. 1 B. 2 C. 3 D. 4