Human blood has a pH range of 7.35 to 7.45. This pH is maintained very strictly because a significant deviation can be fatal. How is the pH of blood best classified?

Consider cellular respiration and photosynthesis in a plant. In cellular respiration, the source of electrons is ______, whereas in photosynthesis, the source of electrons is ______.

Which of the following statements best describes the function of an enzyme and its effect on a chemical reaction?

Oxygenic photosynthesis is the type performed by plants, algae, and cyanobacteria, which releases oxygen. Anoxygenic photosynthesis, performed by other bacteria, does not release oxygen. What is a key similarity between these two processes?

In human saliva, the enzyme amylase breaks down the starch in foods such as potatoes, rice, and pasta into smaller sugar subunits including its monomer glucose. This process begins in the mouth. If amylase were not present in saliva, the breakdown of starch would still occur, but at a much slower rate. What is the role of salivary amylase in this reaction?

Chloroplasts are the sites of photosynthesis in plant cells. Based on the theory of endosymbiosis, which of the following provides the strongest evidence for their evolutionary origin?

When synthesizing new DNA strands during DNA replication, the enzyme DNA polymerase requires magnesium ions (Mg2+) in order to function correctly. The magnesium ions function by helping position nucleotides within the active site of DNA polymerase, thereby helping the reaction proceed. This means these magnesium ions are serving as ______.

The sodium-potassium pump in a neuron’s membrane actively transports sodium ions out of the cell and potassium ions into the cell, which is crucial for nerve impulse transmission. Where does the pump get the energy to move these ions against their concentration gradients?

Which is not a complication of diarrhea?

Poor nutrition can lead to complications in wound healing.