A structure found within penguins that is used for storing food for feeding the young is called the:
a. crop.
b. salt gland.
c. gular pouch.
d. amnion.
e. cloaca.
A
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Some individual hormones have so many different effects because
1.they influence gene transcription. 2.they trigger a second messenger system that produces a cascade of effects. 3.there are a great many different cells in different tissues that have specific receptors for the hormone. 4.the hormone is carried throughout the body and only a small amount is needed to produce its effect. 5.all of the choices
In what structure is the sperm of a flowering plant contained?
A) stigma B) carpel C) pollen D) spore
I am characterized by having a test and axopods. Who am I?
a. green algae b. actinopods c. opisthokonts d. stramenopiles e. foraminiferans
If a bacterium containing a mutation in the avirulence gene lands on a plant that has the corresponding R gene, the bacterium may not initiate rapid cell death in the plant.
Answer the following statement true (T) or false (F)