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Which of the following organelles is not enclosed by a membrane?

A scientist has developed an explanation for a biological phenomenon. She has tested it multiple times, and it has been supported by a vast body of evidence from many different studies. However, the public often dismisses her findings by saying, “It’s just a theory.” How does the scientific use of the term “theory” differ from its common use?

During meiosis I, homologous chromosomes are paired up and align at the metaphase plate, and then are separated and pulled to opposite poles of the cell. What two phases are being described in this process?

A bacterial cell in a nutrient-rich environment divides by binary fission. What does this process accomplish for the bacterial population?

The enzyme isocitrate dehydrogenase in the Krebs cycle requires the molecule NAD+ to function properly. NAD+ carries electrons from one molecule to another, which is essential for the enzyme’s function. What is NAD+ in this scenario?

In addition to the production of ATP and reducing power, what are the byproducts of cellular respiration in a human cell?

A scientist is testing a new drug to see if it lowers blood pressure. She gives one group of patients the drug and a control group a placebo. She then measures the blood pressure of both groups after one month. What is the dependent variable in this experiment?

According to the endosymbiotic theory, mitochondria evolved from an ancient aerobically respiring bacterium. This theory helps to explain why which metabolic pathways are located inside the mitochondria?

What is a major difference in the role of electrons in cellular respiration and photosynthesis?

A plant uses light energy to convert carbon dioxide and water into glucose. What can be said about this process?