"Vertebrates" refers to animals that possess
a. hair.
b. mammary glands.
c. the ability to give birth to live young.
d. lungs.
e. a backbone.
E
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Speciation in animals can occur in the absence of geographic isolation.
Indicate whether the statement is true or false
Scientists discovered that the primary reason leaves either develop as simple or compound is related to:
A. whether the KNOX gene is active or not active B. where the leaf primordium is positioned C. whether auxins are moving in the stem tip D. how fast the KNOX gene arrives at the primordium E. the protein PHANTASTICA and its interaction with auxins
The GAL gene system in yeast is used to metabolize galactose. In the presence of galactose, the GAL genes are expressed; however, in the absence of galactose, the GAL genes are repressed. A yeast mutant is discovered that continuously expresses the GAL
genes in the presence or absence of galactose. Which GAL gene is likely mutated? A) GAL3 B) GAL4 C) GAL1 D) GAL 10 E) GAL180
Identify the statement that correctly describes hydrogen bonds.
A) any bond with a hydrogen B) attraction between a slightly positive atom of one molecule and a slightly negative atom of another molecule C) a bond between two hydrogen atoms to form H2 D) attractions between hydrogen and oxygen to form a water molecule E) attractions between oppositely charged ions