Water provides electrons, hydrogens, and oxygen in photosystem I. The resulting electrons in photosystem I
A. replace the electrons lost by chlorophylls.
B. are added to hydrogens so they can be transported across the thylakoid membranes more easily.
C. directly pass through ATP synthase enzymes to activate them in transforming ADP to ATP.
D. are added back to oxygen.
E. are used by the rubisco enzyme to complete carbon fixation with RuBP and CO2.
A. replace the electrons lost by chlorophylls.
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Why is it so important that all of the chromosomes align on the metaphase plate during metaphase?
A. This is the only place in the cell where the cyclins and Cdks are located. B. If they cannot, it suggests that they aren't properly attached to the spindle microtubules, and thus won't separate properly during anaphase. C. This is the location where the chromosomes can become attached to the spindle microtubules. D. This allows asters to form. E. This allows sister chromatids to form.
What evidence is there that choanoflagellates were the ancestors to animals? What will be an ideal response?
Which of the following is true concerning postnatal development?
a. Infancy is defined as the first two years of life after birth. b. Senescence results in increased hormone secretion. c. Postnatal development occurs before birth. d. In general, boys experience their pre-adolescent growth spurt later than girls. e. Early childhood is a time of rapid cell division in nerve cells.
You want to design a DNA probe used for hybridization to isolate a clone from a cDNA library. Which of the following concerns about DNA probe design is the most legitimate?
(a) You must be careful when designing your probe to take into account which DNA strand was transcribed in mRNA and choose a probe complementary to the mRNA. (b) You must be careful not to include any DNA sequences in your probe that are upstream (5?) of the AUG start codon. (c) You must make sure that all the DNA sequences in your probe lie within an exon, and do not span two exons. (d) You must make sure that all the DNA sequences in your probe are not located downstream (3?) of the polyadenylation signal.