exam 2

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Organelles

Cells contain organized structures that perform a specific function. These are known as

which of the following is an accurate description of the plasma membrane

it is a phospholipid bi layer embedded with proteins

the first law of thermodynamics states that

energy can neither created nor destroyed

all the mass of an atom is considered to be in the

protons and neutrons

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:

bacterium

Which of the following is endergonic

the synthesis of glucose from carbon dioxide and water

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 of the following is the correct order of events in a cell

DNA makes RNA, RNA makes proteins

which of the following is true of energy

it can be stored in chemical bonds

Isotopes are atoms of the same element that differ in their:

number of neutrons

which choice below correctly matches organelle with function

smooth endoplasmic reticulum- lipid production

The sodium potassium pump is an example of

active transport

the three main products of glycolysis are

ATP NADH and pyruvic acid

If a person is unable to clot blood properly,which of the following might be lacking?

platelets

Unique chemicals group that confer special properties to an organic molecule are called:

functional groups

The cytoskeleton is composed of

micro filaments, intermediate filaments and micro tubules

coupled reactions are

reactions in which endergonic reactions obtain the energy to go forward from exergonic reactions.

atoms with eight electrons in their outer shells tend to

be stable and unreacitve

entropy is the measure of ____in a system

energy

which of the following statements concerning the electron transport chain is FALSE

the electron transport chain will work whether oxygen is present or not

The___ of a phospholipid molecule will seek water, whereas the____of the mo

head,tail

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

Kinetic:potential:kinetic

Which blood vessels are structurally suited for the central purpose of allowing substances to pass in and out of them through their entire lengths

capillaries

Which of the following would form the fewest covalent bonds

neon (eight electrons in the second shell)

The monomers of polysaccharides are

none of the above

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

Lipids

Plasmodesmata and gap junctions are similar in that they

allow cells to communicate with each other

Glucose can be broken down to provide energy for the beating of cilia. Therefore,the glucose must contain

potential energy

Some enzymes contain molecules in the active site that help facilitate chemical transformations. These molecules are called.

Coenzymes

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

Blood carries most nutrients straight from the small intestine to which organ.

the liver

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 ____

solvent;solute;solution

Cell walls can be found as part of

plant cells,bacteria,fungi and protists

when the diaphragm contracts,the thoracic cavity (aka rib cage)____and you____

gets larger:inhale

which of the following is an example of a molecule being oxidized?

NADH being converted into NAD+

What makes an enzyme a catalyst

it speeds up a chemical reaction but is not changed by the reaction

blood flow from the heart,to the lungs,and back to the heart is known as the

pulmonary circulation

All of the following are functions of proteins except:

Storing genetic information

Diffusing molecules move___until they are____

down their concentration gradients; evenly disturbed

which of the following would you find in a plant cell but not an animal cell

a central vacuole

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?

fat

what does oxygen allow humans to do?

produce more ATP from food

which structure contains deoxygenated blood?

pulmonary artery

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