The bundle sheath in a monocot leaf
a. is filled with intercellular space.
b. is the location of stomata.
c. is covered with a cuticle to prevent water loss.
d. functions in a manner somewhat similar to the root endodermis.
c
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Protists that have a single flagellum are called ____
a. heterokonts b. unikonts c. dikonts d. euglenoids e. rhizarians
The vast majority of proteins expressed early in an animal's development
a. are translated from preexisting mRNAs present in the unfertilized egg. b. are translated from preexisting mRNAs delivered by the sperm that fertilized an egg. c. are translated from mRNAs that were transcribed from the zygote's DNA in the first three rounds of cell division. d. are transcribed and translated from the unfertilized egg's DNA postfertilization. e. were present as inactive proteins in the unfertilized egg.
Photosynthesis first occurs on Earth by about
___ years ago.
a. 4.6 billion b. 3.5 billion c. 2.7 billion d. 1.1 billion e. 0.5 billion
Mitochondria are usually inherited from
1.both parents. 2.the male parent. 3.the female parent. 4.neither parent. 5.None of the options is correct.