Asexual reproduction in plants does NOT involve
(a). Daughter plants being genetically identical to the parent plant.
(b). The production of gametes.
(c). a portion of one plant giving rise to a completely new plant.
(d). vegetative propagation.
(e). the use of runners.
Ans: (b). The production of gametes.
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Sxl protein mediates differential expression of genes further downstream in the developmental pathway
In females, active Sxl protein produced from Pm leads toproduction of proteins that facilitate female development—first Tra protein, which then, with Tra-2, facilitates splicing of the mRNA for active Dsx protein. In males: A. the absence of Sxl leads to a different splicing pattern of tra transcripts; a different version of Dsx isproduced that leads to male development. B. transcription from promoter Pe results in acharacteristic splicing pattern and the production of a burst of active Sxl protein. C. only stop codons are recognized, leading to splicing of Tra and overactivity of SxI. D. the start codons are preferentially removed in splicing, causing a premature termination of Dsx translation leading to male development.
Which of the following molecules is most likely to cross the cell membrane directly by passive diffusion?
A) Na+ B) fructose (a sugar) C) a steroid hormone (a hydrocarbon) D) insulin (a polypeptide) E) fructose and insulin
The outermost region of the kidney is called the:a
adventitia. b. mucosa. c. pelvis. d. cortex. e. medulla.
What is a ribosome made of?
a. tRNA and rRNA b. tRNA, rRNA, and mRNA c. rRNA and proteins d. rRNA and mRNA