Why is the cohesion of water important for biological systems? A) It helps to moderate the temperature of cold-blooded animals. B) It prevents chemical reactions from occurring in body systems. C) It helps transport water from the roots to the leaves of a plant. D) It prevents salts from dissolving inside the plasma membrane.
Why is the cohesion of water important for biological systems? A) It helps to moderate the temperature of cold-blooded animals. B) It prevents chemical reactions from occurring in body systems. C) It helps transport water from the roots to the leaves of a plant. D) It prevents salts from dissolving inside the plasma membrane.
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Related questions
1,Match the descriptions to the type of transport.
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2,Describe what is wrong with the following statement and explain why:
All prokaryotic and eukaryotic cells contain plasma membrane, nucleus, ribosomes, organelles, cytoplasm, and cell walls.
What is short-distance transport?
a, | The movement of solutes from a region of low concentration to a region of high concentration | |
b,The movement of water, nutrients, and other substances between cells | ||
c, | The movement of substances from a region of high concentration to a region of low concentration | |
d, | The movement of water across a semipermeable membrane from a region of low solute concentration to a region of high solute concentration. |
What terms describe the movement of water across a semipermeable membrane from a region of high water concentration towards a region of low water concentration (and high solute concentration.)
What is found in the proptoplasm?
Cell wall, cytoplasm, plasma membrane, nucleus, and other cell organelles | ||||||||||||||||||||||||||
Plasmodesmata, cell wall, and plasma membrane | ||||||||||||||||||||||||||
Cell wall, cytoplasm, and plasma membrane | ||||||||||||||||||||||||||
Cytoplasm, nucleus, and other cell organelles The channels that allow nutrients and protoplasm to pass between plant cells are called _________________. What happens when a plant cell is placed in a hypotonic solution?
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Question 1
Plasma membranes are selectively permeable. This means that
A. | glucose cannot enter the cell. | |
B. | the plasma membrane allows some substances to enter or leave a cell more easily than others. | |
C. | plasma membranes must be very thick. |
Question 2
Oxygen molecules O2 crosse a plasma membrane by
A. | passive transport | |
B. | osmosis | |
C. | active transport |
Question 3
Facilitated diffusion across a biological membrane requires ________ and moves a substance ________ its concentration gradient.
A. energy and channel proteins; against (up) | ||
B. transport proteins that make channels ; down | ||
C. energy ; down |
Question 4
When two aqueous solutions that differ in solute concentration are placed on either side of a semipermeable membrane and osmosis is allowed to take place, the water will
A. move to the side with lower water concentration | ||
B. | move to the side with higher water concentration | |
C. | move to the side with lower solute concentration |
Question 5
Kinetic energy differs from chemical energy in that
A. | chemical energy is a particular form of kinetic energy. | |
B. | kinetic energy is the energy of a moving object, whereas chemical energy is the potential energy of molecules. | |
C. | kinetic energy is stored energy that has the potential to do work, and chemical energy is the energy of movement. |
Question 6
When a cell uses chemical energy to perform work, it uses the energy released from a(n) ________ reaction to drive a(n) ________ reaction.
A. | exergonic; endergonic | |
B. | endergonic; exergonic | |
C. | spontaneous; exergonic |
Question 7
When an enzyme catalyzes a reaction
A. it raises the activation energy of the reaction. | ||
B. it lowers the activation energy of the reaction. | ||
C. it is used once and discarded. |
Question 8
Which of the following statements regarding enzyme function is false?
A. An enzyme's function depends on its three-dimensional shape. | ||
B. Enzymes are very specific for their substrates. | ||
C. Enzymes are used up when they catalyze a chemical reaction so must be synthesized for each new chemical reaction |
1. Select the true statements concerning tracheids.
Tracheids are responsible foranchoring the plant to a substrate. | |
Pterophytes lack tracheids but haveeuphylls. | |
Without tracheids colonization ofland would not have been possible. | |
All of the large dominant extantland plants are tracheophytes. | |
Tracheids allow for efficienttransport of water over longer distances. |
2. Plants lacking well-developed conducting systems such asmosses, liverworts, and hornworts have been called
sporophytes. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
bryophytes. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
gymnosperms. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
gametophytes. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
angiosperms. 3.Select the true statements concerning gametophytes andsporophytes.
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