In Frits Went's coleoptile experiment,what was the most likely phytohormone transported from the coleoptile tip into the agar block?
(a) Brassinosteroid
(b) Gibberellic acid
(c) Ethylene
(d) Auxin
(e) Abscisic acids
Ans: (d) Auxin
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Gamma radiation
A. is used to sterilize some food products. B. is a type of nonionizing radiation. C. has a longer wavelength than UV radiation. D. has poor penetrating power.
The three phylogenetic trees shown here all contain the same members and all have a common ancestor, but are divided up in three different ways. Which tree has members circled that are of more than one evolutionary line and does not include the most recent common ancestor of the included lineages? What type of group is this?
A. Tree 1; monophyletic.
B. Tree 2; polyphyletic.
C. Tree 2; paraphyletic.
D. Tree 3; monophyletic.
E. Tree 3; polyphyletic.
Sexual reproduction occurs when _______.
a. an unfertilized egg develops normally b. two female gametes fuse and develop c. a sperm from a male fuses with an egg from a female d. two male gametes fuse and develop
You are analyzing some material gathered from a bacterial cell. You find it tests positive for both polysaccharides and amino acids. What part of the bacterial cell did this sample come from?
A. S-layer B. glycocalyx C. cell membrane D. nucleoid E. cell wall