A biologist discovers a new single-celled organism in a pond. To confirm it is a living organism, which of the following characteristics must it exhibit?

In the oxygen gas molecule (O2​), two oxygen atoms are held together by a chemical bond. Both oxygen atoms have the same electronegativity, so they pull on the shared electrons with equal force. What type of bond do they form?

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

DNA, the genetic blueprint of life, has a double helix structure. What type of chemical bonds are responsible for holding the two strands of the double helix together?

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

All living organisms, from single-celled bacteria to multicellular elephants, are made of one or more cells. The cell is the basic unit of life. Which of the following principles of the cell theory does this statement describe?

Jams and jellies have a high sugar concentration, which helps to preserve them. Why is this high sugar concentration effective at preventing the growth of molds and bacteria?

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?

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?

A pedigree chart shows a genetic disorder that is autosomal recessive. The parents are both carriers (heterozygous). What is the probability that their child will be affected with the disorder?