Albert Einstein, a theoretical physicist who developed the theory of relativity, undoubtedly made a substantial impact on science, but his fame in popular culture is perhaps more _______ than that of Isaac Newton, who formulated the laws of motion and universal gravitation, accomplishments for which he will long be celebrated.

Which choice completes the text with the most logical and precise word or phrase?

Biologist Dr. Elena M. Rodriguez conducted a 2021 study on wild chimpanzees that used sticks to extract termites from mounds. Skeptical colleagues initially suggested to Dr. Rodriguez that the chimpanzees' interactions with the sticks might simply be __________, but Dr. Rodriguez and her team showed that the chimpanzees were using the sticks strategically.

Which choice completes the text with the most logical and precise word or phrase?

In the American college experience as depicted in literature, students often find themselves in a(n) _______ maze of opportunities: academic pursuits open doors to new knowledge; extracurricular activities foster personal growth and leadership skills; and social interactions shape their understanding of diverse cultures and perspectives.

Which choice completes the text with the most logical and precise word or phrase?

Scholarly accounts of the Civil Rights Movement—a movement that advocated for the rights and equality of African Americans and reached its height in the 1950s and 1960s—tend to focus on the most charismatic, vocal leaders in the movement, making it seem uniformly heroic. Historian Lisa Thompson has shown, however, that if we shift our focus toward the way the movement manifested in comparatively low-profile community efforts and projects, we see participants espousing an array of political orientations and approaches to civil rights activism.

Which choice best describes the function of the underlined portion in the text as a whole?

In a study conducted by Dr. Jane Smith on cellular signaling pathways, researchers explored the role of the protein kinase Akt in regulating cell growth and survival. Akt, also known as Protein Kinase B, is activated through a series of phosphorylation events triggered by various growth factors and hormones. Once activated, Akt can phosphorylate a variety of downstream targets, leading to increased protein synthesis, inhibition of apoptosis (programmed cell death), and promotion of cell proliferation. Dr. Smith's research revealed that Akt is a critical mediator of these processes, integrating signals from the cell's environment to maintain cellular homeostasis.

Which choice best states the main purpose of the text?