Log in to make full use of the services
Although a liver cell and a muscle cell in a human developed from the same single cell, their appearance and functions are different. This is because the liver cell*
Beta cells in the pancreas and human skin cells both contain the insulin gene. The beta cells can make insulin; however, skin cells cannot. Which process is responsible for this gene being expressed in one cell type and not in another cell type?*
Eye color, hair color, and skin color often vary from person to person and even within a family. One explanation is that*
Although all of the cells of a plant contain the same genetic material, root cells and leaf cells are not identical because they*
Body cells include nerve cells and muscle cells. Each makes a number of different proteins. For example, nerve cells make cholinesterase and muscle cells make myosin. Which statement best compares the DNA normally found in these two types of cells in an individual?*
Following fertilization, a zygote divides and soon becomes a multicelled embryo with many different cell types, as represented below.
Which statement best explains this development?*
In an organism, a muscle cell has the same DNA as a nerve cell, yet the cells perform different functions. This is possible because*
Base your answer to question 8 on the graph below and on your knowledge of biology. The graph shows the level of gene expression of five different genes in normal and cancerous cells.
Which statement is a valid inference that can be made based on the data in this graph?*
The development of nerve, muscle, and skin cells is represented in the diagram below.
Which statement best explains how each of the different cell types can develop from the same embryo?*
Base your answers to questions 10 on the diagrams below and on your knowledge of biology. The diagrams represent a single-celled organism and a multicellular organism.
Cells from structure E and cells from structure G are similar in that they*
Which statement best explains why different body
cells of the same individual look and function differently?*
Which factor would cause two specialized tissues that contain identical chromosomes to function differently?*
Base your answers to questions 13 on the information and photograph below and on your knowledge of biology.
Scientists Investigate Sex Determination in Alligators
The sex of some reptiles, including the American alligator, is determined by the temperature at which the eggs are incubated. For example, incubating them at 33°C produces mostly males, while incubation at 30°C produces mostly females.
Scientists recently discovered a thermosensor protein, TRPV4, that is associated with this process in American alligators. TRPV4 is activated by temperatures near the mid-30s, and increases the movement of calcium ions into certain cells involved with sex determination.
Which information was most essential in preparing to carry out this scientific investigation?*
Base your answers to questions 14 on the information below and on your knowledge of biology.
The testes of a human male produce gametes. The process that produces these gametes differs from the process that produces new skin cells in the same individual.
How does the genetic makeup of the skin cells differ from the genetic makeup of the gametes? *