Biology Exam #2 + quizzes

Which of the following would not move through the lipid bilayer of a plasma membrane

K+

What are the membrane structures that function in active transport?

integral proteins

If 2400 ml of water is added to a 600ml of a 30% solution of sucrose, what is the new concentration?

30 x 600 = C2 x 3000 = 6%

If 2500 ml of water is added to a 500 ml of a 40% solution of sucrose, what is the new concentration

5%

C6 H12 O6 +6O2 ----> ^ CO2 + 6H20 + Energy

C6H12O6 is oxidized and O2 is reduced

C6H12O6 + 6O2----> ^CO2 + 6H20 + Energy

C6H12O6 is oxidized and O2 is reduced

Which of the following is a statement of the first law thermodynamics

Energy cannot be created or destroyed

Which of the following statements regarding enzymes is true

Enzymes increase the rate of a reaction

The oxygen that is released during photosynthesis comes from:

H20

Which of the following molecules is in a reduced state?

NADH

Which of the following would likely move through the lipid bilayer of a plasma membrane most rapidly?

O2

What is the purpose of fermentation? What are the products of fermentation?

Purpose: to restore NAH+, Product: Lactate & NAD+

Penicillin is toxic to certain dividing bacterial cells because it prevents cell wall formation, causing the cells to burst. This indicates that the bacteria live in:

a hypotonic medium

The primary role of oxygen in cellular respiration is to

act as an acceptor for electrons and hydrogen, forming water

Which of the following are characteristics of an enzyme?

all of the above

Deamination will take place in the catabolism of which of the follwing

amino acid

A + B + Energy ----> C

anabolic & endergonic

6CO2 + 6H2O + light energy --> C6H12O6 + 6O2

anabolic, endergonic

Where are the molecules of the electron transport chain found in plant cells

both A & C- thylakoid membranes of chloroplasts and inner membrane of mitochondria

What type of signal molecules will bind to receptors located on the plasma membrane

both B & C, large hydrophilic and ions

Which of the following occur in a leaf cell of a plant?

both photosynthesis and respiration

What is the purpose of beta oxidation in respiration?

breakdown of fatty acids

If a red blood cell were put in a hypotonic solution, it would

burst

As a consultant to a major drug company in Colombia, you are to figure out a way to move a drug rapidly into a cell. or this drug to be effective it needs to be in a cell quickly. How can this be achieved??

by increasing the concentration of the drug

Which term most precisely describes the cellular process of breaking down large molecules into smaller ones

catabolism

Which term most precisely describes the cellular proses of breaking down large molecules into smaller ones

catabolism

Which of the following is not an enzyme

cellulose

Cells transport many molecules across the plasma membrane through simple diffusion. Which of the following is the single most important factor affecting this transport

concentration gradient

What is the relation between exergonic and endergonic reactions and ATP

exergonic produce ATP while endergonic consume ATP

Which of the following membrane activities does require the expenditure of energy by the cell

exocytosis

Glucose will not diffuse through artificial phospholipid bilayers... Using this information, which transport mechanism is most probably functioning in the intestinal cells

facilitated diffusion

During aerobic respiration, electrons travel downhill in which sequence?

food_NADH_electron transport chain_oxygen

Which of the following can occur in the absence of oxygen

glycolysis

Which of the following takes place in the cytosol of the cell

glycolysis

Which of the following occurs in the cytosol of a eukaryotic cell

glycolysis and fermentation

Chlorophyll the green pigment of photosynthesis is least likely to absorb which of the color /s of light

green

Celery stalks that are immersed in fresh water for several hours become stiff and hard. Similar stalks left in a salt solution become limp and soft. From this we can deduce that the cells of the celery stalks are:

hypertonic to fresh water but hypotonic to the salt solution

Where would you see a higher concentration of H+ in the chloroplast?

in the thylakoid lumen (inside the thylakoids)

Where is ATP synthase located in the mitochondria

inner membrane

Where would you see a higher concentration of H+ in the chloroplast

inside the thylakoids

Where are the proteins of the electron transport chain located

mitochondrial inner membrane

In a eukaryotic cell, the critic acid cycle occurs in the

mitochondrion

Which of the following membrane activates does not require the expenditure of energy by the cell?

osmosis

Which of the following produces the most ATP, when glucose (C6 H12 O6) is completely oxidized to carbon dioxide (CO2) and water

oxidative phosphorylation (chemiosmosis)

Which of the following produces the most ATP, when glucose (C6 H12O6) is completely oxidized to carbon dioxide (CO2) and water

oxidative phosphorylation (chemiosmosis)

Which of the following processes include all others?

passive transport

Which of the following processes includes all others

passive transport

Which of these are not embedded in the lipid bilayer at all

peripheral proteins

White blood cells engulf bacteria through what process

phagocytosis

Which of the following types of molecules are the major structural components of the cell membrane?

phospholipids and proteins

Which of the following does not occur during the Calvin cycle

release of oxygen

What kinds of things pass through a cell membrane most easily?

small and hydrophobic

Where do the reactions of Calvin Cycle take place?

stroma of the chloroplast

Which of the following are chemical messengers that pass through the plasma membrane of cells and have receptor molecules in the cytoplasm

testosterone

In the mitochondria, the electron transport system translocate protons from the matrix into the intermembrane space, whereas in chloroplasts, the electron transport system translocate protons from

the stroma to the thylakoid space

Assume a thylakoid is somehow punctured so that the interior of the thylakoid is no longer separated from the stroma. This damage will have the most direct effect on which of the following processes

the synthesis of ATP