Which is the most likely function of a group of cells that contains a high number of chloroplasts?
A respiration
B transpiration
C fermentation
D photosynthesis
What will most likely happen if an appropriate enzyme is added to a chemical reaction?
A The reaction rate will increase.
B The equilibrium of the reaction will be maintained.
C The reaction rate will decrease.
D The reaction will stop.
In humans, glucose is kept in balance in the bloodstream by insulin. Which concept does this best illustrate?
A adaptation
B homeostasis
C metabolism
D organization
A sugar, a phosphate group, and a nitrogen base form the building blocks of which organic compound?
A carbohydrates
B lipids
C nucleic acids
D proteins
In which way are photosynthesis and cellular respiration different?
A Cellular respiration stores ATP, while photosynthesis releases ATP.
B Cellular respiration produces oxygen, while photosynthesis uses oxygen.
C Photosynthesis releases energy, while cellular respiration stores energy.
D Photosynthesis uses carbon dioxide, while cellular respiration produces carbon dioxide.
This chart shows the results of several crosses with white-feathered chickens and dark-feathered chickens. Which cross would be represented as Aa × aa, where (A) represents a dominant allele and (a) represents a recessive allele?
A Cross 1
B Cross 2
C Cross 3
D Cross 4
A researcher sprays a new pesticide on thousands of insects of the same species that live in a large field. A few of the insects survive. What can be concluded by the researcher?
A The species of insects will likely become resistant to the pesticide.
B The ideal interval between the first and second applications of the pesticides should be increased.
C The pesticide has no effect on the species.
D The concentration of the pesticide was too weak.
According to fossil records the horses that lived 50 million years ago were much smaller, weaker, and slower than modern horses. Which process is most likely responsible for the changes that have led to the increased size, strength, and speed in horses?
A commensalism
B inbreeding
C migration
D natural selection
In a particular species of plants, when the soil pH is greater than 7, blue flowers are produced. However, when the soil pH is less than 7, pink flowers are produced. Which statement best explains the color change in the plant?
A Multiple alleles determine the color of the flowers.
B The change in flower color is a result of a mutation.
C Polygenic inheritance produces the different flower colors.
D The environment influences the expression of the gene for flower color.
A cloned plant has a diploid chromosome number of 12. What is the diploid chromosome number of the plant cell that was used to produce the cloned plant?
