Science Practice Questions

A chemical in a cell increases the rate of a specific chemical reaction. This chemical is most likely composed of which of the following monomers?

Which of the following terms describes the relaxation of the chambers of the heart during the cardiac cycle?

Two researchers observe that when weed A and weed B grow next to each other, the roots of weed A stop growing once they enter the root zone of weed B. Because activated charcoal is known to absorb organic compounds, the researchers apply activated charcoal to the soil around weed B. They then observe that the roots of weed A grow into the zone of weed B. Which of the following hypotheses is being tested by this experiment?

Which of the following classes of biomolecules can influence the rate of specific chemical reactions within the living cell?

A pea plant has a dominant homozygous genotype for a given trait (represented by allele W). Which of the following best represents this genotype?

Which of the following is at the core of every virus particle?

Which of the following correctly describes the structure and function of the cell membrane?

Because muscle cells require large amounts of energy to function correctly, which organelles would be abundant in those types of cells?

Subcutaneous fat can be found in which of the following layers of the skin in the human body?