Flashcards in Chapter 3 Deck (112)
What stage occurs when two daughter cells have completely formed?
Telophase (the last stage)
True or false: Vesicles can form for things leaving a cell as well as entering?
What kind of proteins in a membrane function as enzymes?
Peripheral. (They line the inner surface of the cell membrane.)
What is bound by two layers of membrane called the nuclear envelope?
During aging or apoptosis, the structure and dunction of the organelles and chromosomes undergo many what?
Hormones come in contact with what kind of molecules in a membrane?
Rod-like protein molecules
Osmosis is considered a special case of diffusion and is what in nature?
Cancer cells can disseminate to other areas by a process called what?
What contains membranes that are able to condense molecules into packages that can be transported?
The process that results in daughter cells with half of the original chromosome number is what?
Which of the following are the smallest cells? Human ovum, red blood cel, white blood cell, smooth muscle cell.
Red blood cell. (It is 7.5 micrometers in diameter.)
Two chromatids are attached at what region?
The centromere region
What determines the function of a cell?
The following molecules freely pass through a cell membrane except which one? Oxygen, carbon dioxide, amino acids, certain lipids.
What is a general process of nuclear division called?
DNA can be found within chromosomes during division but prior to division DNA exists as long thin stands of what?
Only proteins have the ability to what?
Recognize another molecule
In what part of the nucleus does ribosome production occur?
In the area of the nucleolus
Membranous sacs that contain fluids or particles for transport are called that what?
In biological systems, water is the what?
The cells in a heart muscle are often held together by areas called what?
What is the term for chemical particles in a cell which appear lifeless and have no obvious function?
What is the organelle that plays a complex function in cell respiration?
Centriole. (Each centrosome organelle is comprised of two centrioles)
True or false: a selectively permeable membrane allows proteins to pass through?
The main division process in the early embryo is called what?
Membranes that have a higher osmotic pressure on one side tend to do what?
Draw water towards that side
The following belong together except which one? Microtubule microvilli, aid in DNA movement, comprise an internal skeleton.
Microvilli (they are simple columnar cells specialized for absorption)
Chromatin is DNA and histone proteins arranged in what?
What is the most critical factor in determining its function?