Four of the five plants below have vascular tissue
Select the exception.
a. whisk ferns
b. mosses
c. pine trees
d. flowering plants
e. horsetails
Answer: b
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The genes needed for ?-carotene synthesis are not normally expressed in endosperm. In the creation of golden rice, how did researchers ensure that these genes were expressed in rice endosperm?
A) The genes were injected only in the endosperm of rice grains. B) Agrobacterium cells were added only to rice grains, not to any other part of the plant. C) The protein-coding sequence of each gene was linked to a regulatory region of DNA that directed transcription in endosperm. D) The wild-type genes were mutated and new mutant alleles that are expressed only in endosperm were selected.
Which of the following is true of adherens junctions?
A. They are holes in the cell wall through which the plasma membrane and endoplasmic reticulum of adjacent cells are connected. B. They are channels in the plasma membrane of plant cells made of transmembrane proteins that allow ions and small molecules to pass between adjacent cells. C. They are channels in the plasma membrane of animal cells made of transmembrane proteins that allow ions and small molecules to pass between adjacent cells. D. They provide points of structural support between adjacent plant cells. E. They provide points of structural support between adjacent animal cells.
An unrooted tree containing four unrelated species can become rooted by adding
A. a descendant group related to two of the species. B. an unrelated outgroup. C. a descendant related to only one of the species. D. a distantly related outgroup.
The ABO blood types are an example of ____
a. pleiotropy and polygenic inheritance b. multiple alleles and continuous variation c. incomplete dominance d. codominance and epistasis e. multiple alleles and codominance