which of the following is an accurate description of the plasma membrane
it is a phospholipid bi layer embedded with proteins
you isolate a cell with the following characteristics: (1) no nucleus, (2) only single type of organelle, and (3)2um in size.This cell could be a/an:
Facilitated diffusion is similar to simple diffusion because
in both, material move down their concentration gradient
Carbon is such an important element for life because it
can form chemical bonds with a maximum of four other atoms
which choice below correctly matches organelle with function
smooth endoplasmic reticulum- lipid production
Unique chemicals group that confer special properties to an organic molecule are called:
coupled reactions are
reactions in which endergonic reactions obtain the energy to go forward from exergonic reactions.
which of the following statements concerning the electron transport chain is FALSE
the electron transport chain will work whether oxygen is present or not
In many cases, carbohydrates have the following ratio of elements
carbon,hydrogen,and oxygen in a ration of 1:2:1
What is the role of transport proteins within the plasma membrane
Transport proteins allow movement of ions and polar molecules through the plasma membrane
You work hard to pedal your bicycle up a steep hill. You rest when you get to the top then you let your bicycle roll quickly down the other side of the hill. You converted ____energy into ____energy, then you converted it back into
Which blood vessels are structurally suited for the central purpose of allowing substances to pass in and out of them through their entire lengths
Which of the following would form the fewest covalent bonds
neon (eight electrons in the second shell)
Buffering systems work to maintain pH within normal limits by:
removing hydrogen ions when conditions become too acidic and adding hydrogen ions when conditions become too basic.
You notice that water is running off the feathers of a bird in the rain. The reason is probably that the bird has coated the feathers with ___,which keeps the water out of them
Glucose can be broken down to provide energy for the beating of cilia. Therefore,the glucose must contain
Some enzymes contain molecules in the active site that help facilitate chemical transformations. These molecules are called.
You have isolated a cell that is unable to produce cholesterol for its cell membranes. Which of the following defects is this cell most likely to have?
the cell membrane will not have the correct fluidity
You mix sugar in water and stir until it's completely dissolved. In this system, the water is the ____,the sugar is the ____ , and the end result is a ____
Red blood cells placed in pure water will swell and burst. What process is causing this to happen?
water is diffusing across the plasma membrane from a region of high(outside the cell)to low(inside the cell) free water concentration
Living things are highly ordered.so why does life not violate the second law of thermodynamics
life takes in energy to maintain order and,in doing so decreases order elsewhere
Digestion of which organic molecule takes a somewhat more complicated route than most nutrients?