10 auto-graded practice problems. Select an answer, submit, and review the explanation.
Cell Biology
easy
Which organelle is responsible for protein synthesis in a cell?
medium
During which stage of mitosis do chromosomes line up along the equator of the cell?
hard
An electron microscope has a much higher resolution than a light microscope. What is the primary reason for this?
Organisation
easy
In which organ of the digestive system does most of the absorption of nutrients into the bloodstream occur?
medium
Which blood vessel carries oxygenated blood from the lungs back to the heart?
Bioenergetics
easy
What is the word equation for photosynthesis?
hard
A student calculates the rate of photosynthesis at different light intensities. The rate increases at first but then levels off. Why does the rate stop increasing?
Inheritance
easy
In DNA, which nitrogenous base pairs with adenine?
medium
A characteristic controlled by a single gene with two alleles, where the heterozygous phenotype is intermediate between the two homozygous phenotypes, is described as:
Ecology
hard
Which of the following is a valid reason for maintaining biodiversity?