You've stumbled upon a thick mat of moss in the woods. Upon closer inspection, you observe sporophytes emerging from the gametophytes. From your previous biology course, you know that the sporophyte is attached to a(n)
A) archegonium.
B) antheridium.
C) embryo sac.
D) female cone.
E) flower.
A
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In an enzyme-catalyzed reaction, the reactant is called the
A. coenzyme B. catalyst C. substrate D. product
Which one of the following describes an event that takes place during gene regulation at the level of the chromosome?
A. Chromatin becomes condensed in order for transcription to begin. B. Chromatin coils so it can become more accessible to the proteins that carry out transcription. C. RNA polymerase and associated proteins bind to nucleosomes. D. Chromatin is remodeled and nucleosomes are repositioned so that specific regions of the DNA can be made available for transcription. E. Cytosine bases in the sequence near the promoter of a gene become methylated in order to stimulate transcription.
The space between the two membranes of the mitochondrion accumulates ____
a. proteins b. H+ c. carbohydrates d. H2O2 e. CO2
Which of the following is an example of antiport?
-simultaneous movement of an amino acid and protons into the cell -simultaneous movement of an amino acid and protons out of the cell -coupling of the inward movement of water with the outward movement of protons -coupling of the inward movement of Na+ with the outward movement of Ca++ -none of the choices are correct.