Most segmentation genes code for:a
transcription factors.
b. genetic switches such as operators.
c. repressors.
d. insulin-like growth factors.
e. morphogens.
a
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The competitive exclusion principle assumes that the competing species have exactly the same resource requirements
Indicate whether the statement is true or false
Nitrogenous waste is excreted from Malpighian tubules mainly in the form of ____
a. nitrate b. ammonia c. uric acid d. amino acids e. urea
An unusual red sponge is discovered near a deep-sea vent. You want to determine if this is a new species of sponge, so you separate the cells for further study. A new lab assistant accidentally adds cells from a blue sponge to your preparation while you are at lunch. When you return, you find that the sponge cells have reaggregated into a multicellular organism. What do you see if the red and blue sponges are the different species?
A. one sponge with a red side and a blue side B. one blue sponge and one red sponge C. one sponge with blue and red randomly distributed D. one purple sponge (mix of red and blue colors) E. one sponge with alternating red and blue layers of cells
A sterile hybrid plant can form a fertile new species if its chromosomes are doubled. This is referred
to as
a. allopatric speciation b. cladogenesis c. a hybrid zone d. anagenesis e. sympatric speciation