Double fertilization means that _____
A) flowers must be pollinated twice to yield fruits and seeds
B) one sperm is needed to fertilize the egg, and a second sperm is needed to fertilize the polar nuclei
C) the egg of the embryo sac is diploid
D) every sperm has two nuclei
B
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Photoautotrophs are the only organisms that can incorporate (fix) carbon dioxide into biomolecules.
Answer the following statement true (T) or false (F)
In the process of initiation, RNA polymerase and several regulatory proteins bind to a(n) ____________________ that
marks the beginning of a gen Fill in the blank(s) with the appropriate word(s).
Homologous proteins
A) share a common ancestor. B) share a common amino acid sequence. C) are determined by alleles on homologous chromosomes. D) A and B only E) A, B, and C
The transfer of _____________ from one molecule to another is an oxidation-reduction reaction, or redox reaction.
Fill in the blank(s) with the appropriate word.