In a Punnett square, the letters on top of the
square and on the side of the square represent
a. offspring genotypes.
b. parental genotypes.
c. parental gametes.
d. offspring phenotypes.
e. parental phenotypes
C
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Studies have shown that in the flowering plant Arabidopsis the root-shoot axis is established ____
a. by the first cell division of the embryo b. within hours after the seed germinates c. during the torpedo stage of embryonic development d. shortly after the eight-cell embryo stage e. by plant tissues breaking through the seed coat and making contact with soil
Most species of Gram-positive bacteria are
a. photoautotrophic. b. photoheterotrophic. c. chemoautotrophic. d. chemoheterotrophic. e. photochemoautotrophic
Fungi are decomposers and obtain their food by ________ the organic molecules released by the action of secreted enzymes.
Fill in the blank(s) with the appropriate word(s).
Why might a seed be covered in prickly hooks?
A) To aid in seed dispersal B) To allow it to float on water C) To keep it from being eaten D) To help the seed germinate E) To attract insects