The process involving microspore division and a tough wall to protect the gametophyte leads to the production of what end product?
A. anthers
B. pollen
C. eggs
D. stamens
E. ovules
Answer: B
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Imagine you have radioactively labeled a protein in the lumen of the endoplasmic reticulum. Where would you predict the labeled protein might end up?
A. in the lumen of the Golgi apparatus B. in the lumen of a vesicle C. outside the cell D. All of the answer options are correct.
ability to control their level of cell's gene expression A is called
A. gene transformation. B. gene regulation. C. gene splicing. D. gene addition. E. gene correction.
Monosaccharides and amino acids enter brush border cells by ________
a. active transport b. simple diffusion c. facilitated diffusion through hydrophilic membrane tunnels d. emulsification by bile and diffusion across the plasma membrane
Which subphylum includes members that are now all extinct, but which were once extremely numerous in shallow Paleozoic seas?
a. Crustacea b. Trilobita c. Hexapoda d. Myriapoda