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The pressure-flow mechanism for sugar translocation you have learned about in this class is based on research on angiosperms, and thus might not occur in vascular plants. Which of the following real or hypothetical observations on gymnosperms would suggest they possess a different mechanism?
A.) Pores in the sieve areas of their sieve-tube members are filled with numerous membranes.
B.) Gymnosperms do not possess vessels.
C.) Bidirectional phloem transport occurs in gymnosperms.
D.) Asymmetric annual growth rings occur in gymnosperms.
E.) Formation of buds is supported by products of photosynthesis primarily from leaves on the same branch.
q1. the lethal inhalation dose of sarin for a 200 lb person has been determined to be 0.0015mg. find out the ld50 of
q1. assume that a daughter of a mother without the allele and a father with the allele marries a man with hemophilia.
What are the possible genotypes of a female child from the union of a woman who is heterozygous for hemophilia and a man who has normal blood clotting characteristics?
Discuss the role of the cell cycle in a normal cell versus a cancer cell. Describe the role of the cell cycle in normal cell versus a cancer cell.
question 2 which term is not associated with phylogeneticsanswer a.node b.branch c.seed d.root e.all of the above are
a 45-year old lawyer presents to you office complaining of sporadic cough, fatigue, and low-grade fever for the past seven days. ten days prior, he attended a convention in chicago where the air conditionaer was set at 68 f.
Use the following data to answer the questions 1 and 2. In a sample of double-stranded DNA from a particular bacterium with a circular chromosome, 43% of the nucleotide bases are Guanine (G).
Explain in detail why different cell types might or or not respond to a certain signaling molecule; and, why some cells respond to the same signal but with different outcomes. Give and explain specific examples.
What chemical property of the leucine residues thought to form tight ring that prevents the passage of ions within the channel of the acetylcoline receptor suits them for this role.
You are interested in calculating the concordance for a trait of interest. You look at a total of 500 pairs of twins and find that of the 500 pairs, 125 pairs have ONE twin with the trait of interest and 50 pairs have BOTH twins with the trait of ..
Diatoms are mostly asexual members of the phytoplankton. Diatoms lack any organelles that might have the 9+2 pattern. They obtain their nutrition from functional chloroplasts, and each diatom is encased within two porous, glasslike valves.
In a fern's life cycle, of hybrid "1" the sperm in the antheridium was found to have a total of 8 chromosomes. On one of the chromosomes was the dominate gene "T" on one of the chromosomes
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