Multiple choice questions extra

Which of the following is/are part of accepted cell theory?

Every living organism is composed of one or more cells, and all living cells arise from preexisting cells.

The endoplasmic reticulum (ER) is a single membrane continuous with the nuclear envelope and a series of interconnected sacs throughout the cell. Why might it be beneficial to the cell for the ER to be continuous with the nuclear envelope?

It might be beneficial for the ER and nuclear envelope to be connected because it might make it easier for messages to get from the nucleus to the ER where proteins and lipids are made for the cell; this would most likely require the use of less energy.

Compare and contrast the nuclear envelope and the plasma membrane.

The nuclear envelope consists of two concentric phospholipid bilayers while the plasma membrane is only one phospholipid bilayer. Both membranes are selectively permeable and have pores.

Which of the following statements is true of chloroplasts?

They capture energy from sunlight.

Why do scientists repeat their experiments over and over again?

They must make sure the results were not an accident and that they are repeatable.

Which of the following would be the best analogy for the function of the Golgi apparatus?

a worker in a factory who places labels on products and then packs them into a "shipping box"

Which of the following types of organisms are commonly single-celled (unicellular)?

bacteria, some fungi (yeast), and many protozoans

The flexible poles providing structure to a soft-sided tent most closely resemble the

cytoskeleton in an animal cell or other cell without a cell wall.

Using the compound light microscope in the lab room, you observe a wet mount slide preparation. You observe layers of cells that have a definite, rigid, rectangular shape; there appears to be a nucleus in all of the cells and there are many oval-shaped green structures that seem to be moving around inside of the cells in an orderly fashion. What general cell type are you most likely observing?

eukaryotic and plant

Phospholipids are large organic molecules with a ________, polar phosphate head connected to ________, nonpolar fatty acid tails. How do these molecules arrange themselves to form a mostly impermeable barrier between a liposome and its environment?

hydrophilic; hydrophobic; They line up hydrophobic tails facing each other at the center line of the membrane with the hydrophilic heads facing outward, away from the center line of the membrane.

The smooth endoplasmic reticulum

is the site where lipids destined for other cellular compartments are manufactured.

The boundary that surrounds the contents of the nucleus is the

nuclear envelope.

Adenine (A), thymine (T), guanine (G), and cytosine (C) are the ________ building blocks for DNA; they are organized in different combinations to code for all of the proteins needed to accomplish everything the cell does.

nucleotide

Living cells have an intact phospholipid bilayer that separates the cell from its external environment; this structure is commonly referred to as the

plasma membrane.

Ribosomes are very small non membranous organelles that can either exist freely in the cytoplasm or be embedded in the endoplasmic reticulum of a cell; they are associated with the synthesis of

proteins.

The Golgi apparatus

sorts proteins and lipids and sends them to their final destination.

Which of the following would be likely to move through a plasma membrane by simple diffusion?

water (H2O), carbon dioxide (CO2), oxygen (O2)