Biology Flashcards
7 cards from real CLEP practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Biology flashcards as text
Which scientists are credited with proposing the double-helix structure of DNA?
Answer: Watson and Crick
Watson and Crick proposed the DNA double-helix model in 1953.
What is the final electron acceptor in aerobic cellular respiration?
Answer: Oxygen
Oxygen accepts electrons at the end of the electron transport chain, forming water.
A mutation that changes a single nucleotide and results in a premature stop codon is called a:
Answer: Nonsense mutation
A nonsense mutation creates a premature stop codon, truncating the protein.
Which type of plant tissue is responsible for transporting water from roots to leaves?
Answer: Xylem
Xylem conducts water and dissolved minerals upward from roots.
In humans, which structure prevents food from entering the trachea during swallowing?
Answer: Epiglottis
The epiglottis folds over the trachea to direct food into the esophagus.
Which of the following provides the strongest evidence for common ancestry among species?
Answer: Homologous structures
Homologous structures share an underlying anatomy inherited from a common ancestor.
What is the primary product of the light-dependent reactions of photosynthesis?
Answer: ATP and NADPH
Light-dependent reactions generate ATP and NADPH (and release O2) to power the Calvin cycle.