In plant cells, auxin binds to a
a. cell surface receptor and triggers the ras/raf pathway.
b. nuclear receptor that changes its shape so that it can bind to and activate genes.
c. receptor ubiquitin ligase that stimulates the degradation of transcriptional repressors, resulting in activation of genes.
d. cell surface molecule that stimulates fluid uptake.
Ans: c. receptor ubiquitin ligase that stimulates the degradation of transcriptional repressors, resulting in activation of genes.
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Which best describes photo-oxidative damage?
a. low energy environments associated with pigment molecules and excited electrons b. high energy environments associated with pigment molecules and excited electrons c. high energy environments associated with pigment molecules and non-excited electrons
Which of the following is not correct about protostomes?
A. The developmental fate of each cell in the embryo is fixed when that cell first appears. B. Embryonic cells cleave in a spiral pattern. C. The mesoderm splits to form the coelom. D. The blastopore becomes the animal's anus.
A cell is expressing the mutant form of ras, but one of the downstream relay proteins is not present because of another mutation. How will cell division be affected in this scenario?
A) Cell division will decrease because the mutant form of ras decreases cell division. B) Cell division will increase because the mutant form of ras increases cell division. C) The cell will divide normally. D) The cell will not divide at all unless other proteins that stimulate cell division are present.
New genetic variation in a population is a critical aspect of microevolution
Indicate whether the statement is true or false