he addition of H2 to C=C double bonds is an important reaction used in the preparation of margarine from vegetable oils. If 58.0 mL of H2 and 58.0 mL of ethylene (C2H4) are allowed to react at 1.5 atm, the product ethane (C2H6) has a volume of 58.0 mL. Calculate the amount of PV work done, and tell the direction of the energy flow.
. Balls m1 = 4.00 kg and m2 = 2.50 kg collide elastically, as shown in the figure below. After the collision, m1 is travelling to the left with a speed of 1.80 m/s and m2 is travelling to the right with a speed of 2.30 m/s. Calculate the velocities of m1 and m2 before the collision.
Amino acids are molecules with the general structure shown below, where R can be H or various groups of bonded atoms. The 20 different R groups reflect the 20 naturally occurring amino acids. Although amino acids overall are polar, their relative polarity and relative degree of interaction with other substances is governed by the R group.
Amino acids bond together (like “chains”) to form proteins, which exhibit complex 3-dimensional structures resulting from various folds, twists, and turns of the amino acid “chains”. These specific structures occur to provide very specific functions of the protein in an organism.
Ferritin is a protein that stores iron in its core as Fe+3 and releases the Fe as Fe+2 for use in reactions elsewhere in an organism. The iron as Fe+2 (technically in a more complicated form, but we’ll treat it as a simple ion) travels to and from the protein core via two major channels, a 3-fold and a 4-fold channel, illustrated below
3-fold channel 4-fold channel (substances enter through the central hole)
The 3-fold channel is lined primarily with the amino acids aspartic acid and glutamic acid, illustrated below. The 4-fold channel is lined primarily with the amino acid leucine, also illustrated below.
Lines 3-fold channel Lines 3-fold channel Lines 4-fold channel
(a) Into which channel is Fe2+ most likely to travel? Briefly explain your answer by including the dominant interparticle force between it and the amino acid R groups that line the channel.
(b) Into which channel is O2 most likely to travel? Briefly explain your answer by including the dominant interparticle force between it and the amino acid R groups that line the channel.
(c) Suppose there is a region in a protein where a significant amount of H bonding occurs between R groups of amino acids. Which of the amino acids on the previous page could you expect to be present in such a region? Illustrate one possible H bonding interaction between R groups of the amino acid(s) you chose.
How do I solve these questions?
3) Ribose is the initial substrate for the synthesis of AMP and GMP (purine nucleotides and the precursors of ATP and GTP respectively). The following diagram is a simplified overview of this overall metabolic pathway. The numbers refer to enzymatically-catalyzed steps in the pathway.
a) Which enzyme is most likely to be inhibited by high levels of AMP? Explain.
b) Which enzyme is most likely to be inhibited by high levels of IMP? Explain.
c) Imagine a species of animal in which the affinity of enzyme 6 for IMP is lower than the human enzyme. What effect would this have on the rate of production of GMP from IMP in the animal as compared to humans? In these animals, is IMP more or less likely to be feedback inhibiting the enzyme you identified in part b at any given time? Explain.
In humans, dominant alleles control whether you can roll your tongue and whether you have a widow’s peak . People homozygous for the recessive alleles cannot roll their tongues and do not have a widow’s peak. Suppose a tongue-rolling woman with a widow’s peak marries a man who cannot roll his tongue and does not have a widow’s peak. The first child of this couple cannot roll his tongue and does not have a widow’s peak. What are the genotypes of the father, mother, and child?
How much energy must be added to a bowl of 125 popcorn kernels inorder for them to reach a popping temperature of 175°C? Assume thattheir initial temperature is 21°C, that the specific heat capacity of popcornis 1650 J/kg •°C, and that each kernel has a mass of 0.105 g.
the white powder often found on objects made of aluminum oxide. calculate the molar mass of the aluminum oxide. If you wanted to make a molar quantity of aluminum in the laboratory,how many grams of aluminum would you need to begin with?
a. Draw the major organic product of the regioselective reaction of 2-methyl-2-pentene with Cl2 in H2O. Ignore stereochemistry.
Draw the major organic product of the regioselective reaction of 2-methyl-2pentene with Cl2 in H2O. Ignore stereochemistry Mechanism: attack on carbon aClH3C Ca H2C HC b Cl CH3 Cl CH3 H-OHH3C…
Carefully planned nature preserves focus on features that maximize biodiversity,
DESIGNING EFFECTIVE NATURE PRESERVESThe design of natural preserves has evolved. Modern preservesfocus on the use of several design features that maximize theirefficiency, including larger, rather than smaller, preserves; circular,rather than linear, preserves; and:CORRIDORSStrips of land that allow gene flow and reduce inbreedingamong distinct populations in different larger natural preservesCorridorsNatural preservesBUFFER ZONESAreas where limited amounts of human use are permittedthat surround a core natural preserveBuffer zoneNatural preserve
A wave in the ocean has amplitude of 3 m. Winds pick up suddenly, increasing the wave’s amplitude to 6 m. How does this change in amplitude affect the wave’s frequency and the amount of energy it transports?
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