What must be true if the reaction AB + CD rightarrow AC + BD occurs spontaneousl

Question

What must be true if the reaction AB + CD rightarrow AC + BD occurs spontaneously? a) The Delta H of the reaction must be positive. b) The Delta S of the reaction must be positive. c) The reaction must be endergonic. d) The difference between Delta H and T Delta S must be negative. e) all of the above Zinc, an essential trace element for most organisms, is present in the active site of the enzyme carboxypeptidase. The zinc most likely functions as a(n): A) competitive inhibitor of the enzyme. B) noncompetitive inhibitor of the enzyme. C) allosteric activator of the enzyme. D) cofactor necessary for enzyme activity. E) coenzyme derived from a vitamin; AB) some allosteric BS binding to the sneaky bastard site. A cell has the following molecules and structures: enzymes, DNA, ribosomes, plasma membrane and mitochondria. It could be a cell from: a) a bacterium; b) an animal cell, but not a; c) a plant cell, but not an animal; d) a plant or an animal; e) any kind of organism; neither plant nor animal. Plant cells communicate via and would be most similar in function to which of the following animal cell structures? a) gap junctions; c) tight junctions; d); e) water pump. All of the following statements about membrane structure and function are true except: a) Diffusion of gases is faster in air than across membranes. b) Diffusion, osmosis, and facilitated diffusion do not require any energy input from the cell. c) Both sides of a membrane are identical in structure and function. d) Voltage across the membrane is a result of an unequal distribution of ions across the plasma membrane. e) Special membrane proteins can co-transport two solutes by coupling diffusion with active transport. Which of the following would likely move through the lipid belayed of a plasma membrane most rapidly? a) CO_2; b) amino acids; c) glucose; d) K^+; e) starch. Sodium ions (Na^+) diffuse across the cell membrane, but they need assistance. This would be an example of: a) simple diffusion; b) facilitated diffusion; c) active transport; d)osmosis; e) huh? You're rushed to the ER and given an IV (intravenous) saline (salt) solution to rehydrate you. The nurse was not sleeping during biology this time and happened to give you an isotonic IV solution. What would happen to your RBC's (red blood cells) in your blood vessels? a) shrivel; b) lyse/burst; c) nothing; d) you're thinking lawsuit aren't you? After you have broken down your breakfast items into simpler products. The chemical reactions that result in the building of more complex molecules are referred to as ____ reactions. a) anabolic; b) catabolic; c) dehydration; d) none of these. Which of the following is true of synaptic signaling and hormone signaling? a) hormone signaling occurs in animals only. b) hormone signaling is important between cells that are at greater distances apart than in synaptic signaling. c) both use neurotransmitters, but hormone signaling is for adjacent eels m animals only. d) both are forms of signaling.

Explanation / Answer

1) The difference between H and TS must be negative.

2) a cofactor necessary for enzyme activity

3) a. A bacterium

A bacteria doesn't have membrane-bound organelles, which would include mitochondria. This isn't the right answer. And, since you eliminated this answer, you can also eliminate the last answer, as it is now obvious that it can't be any organism.

b. An animal, but NOT a plant.

Plants and animals share ALL of these organelles, so this is wrong.

c. A plant, but not an animal.

Same reason as above: Plants and animals share ALL of these organelles, so this is wrong, too.

.....That would make d. A plant or an animal correct, since these organelles are found in both plant and animal cells.

4) Gap junctions in animal cells are like plasmodesmata in plant cells in that they are channels between adjacent cells that allow for the transport of ions, nutrients, and other substances that enable cells to communicate

5) . Both sides of a membrane are identical in structure and function.

The very opposite is true.

6)
CO2. starch is in fact too great, amino acids are frequently too polar or too non polar. Glucose can diffuse, yet by using capacity of actuality of its length it diffuses very slowly. ok+ consistently demands a potassium ion pump.

7)
In facilitated diffusion, molecules diffuse across the plasma membrane with assistance from membrane proteins, such as channels and carriers.

8)means that the water will want to leave the intravascular space and enter Red Blood Cells (RBCs). So it lyse/ burst

9) Anabolic
As Anabolism refers to chemical reactions in which simpler substances are combined to form more complex molecules

10)Hormonal signaling is important between cells that are at greater distances apart than in synaptic signaling.

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