Hypothesis I: A flavin pigment absorbs blue light; this pigment then activates the proton pump.Hypothesis II: When CO2 concentration rises, a membrane receptor inactivates the proton pump.Air with varying amounts of CO2, within the ranges found in nature, is forced across leaf surfaces and into sub-stomatal cavities; this produces closure of the stomata.
A. Supports both hypothesis I and II.
B. Supports only hypothesis I.
C. Supports only hypothesis II.
D. Supports neither hypothesis.
Answer: C
You might also like to view...
Assume that one allele is completely dominant over the other for the following questions.
a. Two individuals heterozygous for a single trait have children. What is the expected phenotypic ratio of the possible offspring? b. Two individuals heterozygous for two traits have children. What would be the expected phenotypic ratio of the possible offspring? c. Crossing two individuals heterozygous for two traits results in the same phenotypic ratio as for a single trait. Are the genes for these two traits on separate chromosomes or on the same chromosome? Explain your answer. (Remember that the gene for each trait is located at a locus, a physical region on the chromosome.) Yes, the traits would be on the same chromosome as the loci are linked.
Which of the following is a condition caused by a sex-linked inheritance in which a male child will bleed extensively because he lacks the physiological properties to form a blood clot?
A) color blindness B) male-pattern baldness C) hemophilia D) sickle-cell disease
The region of a gene encoding the 5'UTR (5' untranslated region) of an mRNA is not considered to be an exon.
a. true b. false
The antibiotic streptomycin inhibits protein synthesis in bacteria. If this antibiotic is added to a culture of animal cells, protein synthesis in the cytosol continues normally
However, over time, the population of mitochondria in the cell becomes depleted. Specifically, it is observed that the protein-synthesis machinery inside the mitochondria is inhibited. A. Explain this observation based on what you know about the origins of the modern eukaryote. B. What do you expect to observe if, in a new experiment, animal cells are treated with diphtheria toxin, a compound that is known to block cytosolic protein synthesis but does not have any impact on bacterial growth?