The area of this cell in which a chemiosmotic hydrogen-ion gradient is used to produce ATP is represented by the letter
Answer(s): B
The mitochondrion is the organelle in which ATP is produced in eukaryotic cells. Most cells have multiple mitochondria to serve their energy needs. The letter C here points to a single mitochondrion within this cell.
The following data is collected from placing three lizards of different species in separate closed tanks to measure their production of carbon dioxide over the course of 30 minutes.Which of the following conclusions can be accurately drawn from this data?
Answer(s): E
The best conclusion here is that the amount of carbon dioxide produced per gram of body weight is the same for all species (CO., production/Weight in grams = 0.006 for all species.). Be careful with choice D, because although production of carbon dioxide for the 24 gram lizard may be twice as great as that of the 12 gram lizard, one cannot necessarily conclude that the oxygen consumption of the larger lizard is exactly double.
Experiments involving the reduction of the blue dye DPIP, which loses its blue color and becomes clear as it absorbs electrons, have shown that the dye shows the greatest loss of color when in the presence of chloroplasts
Answer(s): A
If DPIP is reduced (gains electrons) to lose its color, then the DPIP will show the greatest loss of color wherever the greatest number of electrons are being knocked around. Chlorophyll loses electrons when it is bombarded by photons of light. Thus, only chlo-roplasts in bright, white light will change DPIP greatly. Boiled chloroplasts will be ineffective due to enzyme denaturation, and chloroplasts in the dark or exposed only to green light will absorb few photons if any. Chloroplasts have no direct effect on sugar production; thus being in a sugar solution should not affect this reaction with DPIP in any way.
In humans, carbon dioxide in the bloodstream is mainly transported from cells to lungs
Carbon dioxide produced by the body's cells mixes with water in the bloodstream to form carbonic acid, which then dissociates into H+ and HC03- (bicarbonate) ions. The hydrogen ions are complexed to hemoglobin in the red blood cells while the bicarbonate ions generally remain in the plasma during the trip to the lungs.
A newly discovered organism has ribosomes that can be inhibited by the antibiotic streptomycin as well as free-floating DNA not enclosed within a nuclear membrane. This organism is most likely a(n)
Bacteria, which are prokaryotes, are classified as such due to their lack of a nuclear membrane housing their DNA. In addition, antibiotics are drugs used to kill bacteria only and do not harm other living organisms or viruses.
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