The male gametophyte is indicated by
a. A.
b. B.
c. C.
d. D.
e. E.
D
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Four small bags are filled with a 10% starch solution. The membrane of each bag contains microscopic pores large enough to let smaller water molecules cross but too small for the larger starch molecules to cross.Each bag is placed in a separate beaker as follows:Bag 1 is placed in distilled water containing no starch (0% starch).Bag 2 is placed in a solution of distilled water and 5% starch.Bag 3 is placed in a solution of distilled water and 10% starch.Bag 4 is placed in a solution of distilled water and 50% starch.The bags are weighed initially and at regular intervals for a specific period of time. Some bags saw a change in weight, and some did not. Answer the following questions based on the expected outcomes of this experiment.a. Which bag should weigh approximately the same at the
end of the experiment as it did at the beginning of the experiment?b. Which bag is expected to be the heaviest at the end of the experiment?c. Which bag is expected to be the lightest at the end of the experiment? What will be an ideal response?
Why does the eyecup of the flatworm only detect light and dark, not images?
A. There are too few photoreceptors. B. There is no lens. C. The eyecup is lined by a pigmented epithelium. D. Flatworms do not have a brain.
A mutation in the DNA of C. elegans means ____________________
a. there may be a change in a single nitrogenous base b. there may be a change in the type of sugar in the backbone of DNA c. it will code for a different lipid molecule d. it will have a different start codon
In flowering plants
a. the gametophytes are smaller than the sporophytes and do not nourish themselves. b. the gametophytes are smaller than the sporophytes but are free-living and nourish themselves for most of their lives. c. the gametophytes are usually larger than the sporophytes, but both gametophytes and sporophytes nourish themselves. d. the gametophytes are usually larger than the sporophytes, and the sporophytes grow out of the gametophytes and are nourished by them. e. the gametophytes and sporophytes are roughly equal in size and each nourish themselves.