biology study
Which best summarizes the role of DNA in the production of proteins?
DNA contains the instructions used to make proteins.
Waxes create a waterproof layer on the outside of some living organisms. To which group of organic molecules do waxes belong?
Lipids
Scientists believe that the polar bear in Alaska and the brown bear in Russia evolved from a common ancestor. Which would be responsible for this evolutionary change?
geographic isolation
During which phase of the cell cycle does most cell growth occur?
interphase
The chemical colchicine disrupts cell division. Which cell process would most likely stop if colchicine were added to a culture of human liver cells?
mitosis
Why must DNA replication have to occur before a cell can divide by mitosis?
to maintain the same number of chromosomes in the daughter cells as in the parent cell
What must happen for the carbon cycle to continue in this terrarium?
All organisms must continue to exchange gases.
How can cells from the same organism have such different shapes and functions?
During differentiation, different parts of the DNA in each type of cell are activated, resulting in the different structure and function of the cells.
In some ecosystems, wolves have been eliminated due to their threats to humans. How can the reintroduction of wolves benefit the ecosystem?
It can eliminate weak animals from a prey population, thereby decreasing competition for natural resources.
Multicellular eukaryotic autotrophs belong to which kingdom?
Plantae
Which effect could a mutation in mRNA have on the production of proteins?
The protein produced will have a different identity.
This diagram shows a red blood cell in a beaker that contains a solution with a higher salt concentration than that inside the red blood cell. CELL IS LOW, WATER IS High
The red blood cell will shrink from losing water molecules.
What determines the function of a specialized cell?
active genes
During translation, what does the tRNA deliver to the ribosomes?
amino acids
How are mitosis and meiosis similar?
both require DNA replication
Which substance do biochemists often search for in fossils to help better understand the evolutionary relationships of the organism that formed the fossil?
dna
Which process can occur in both mitosis and meiosis?
gene mutation
What is the basis for the earliest classification system of organisms?
physical characteristic
What carries the instructions for making amino acids in a protein?
the sequence of nitrogen bases on the mRNA
How does the body of a runner keep up with the demand for energy when cellular oxygen levels are low?
through anaerobic respiration in the cytoplasm
