#1-5
Why is it important that the bonds between the complementary nitrogen base pairs of DNA are weak hydrogen bonds?
to more easily separate DNA strands during replication
See the image on the board.
How does a leaf cell maintain water balance? You must use the words vacuole and stomata in your answer.
Water moves from an area of high concentration inside the vacuoles to an area of low concentration outside the cells when the stomata are open.
What is the association between DNA and amino acids?
A) DNA’s code determines the amino acid sequence for building proteins.
B) Amino acids and DNA act as biological catalysts in the cytoplasm.
C) DNA and amino acids are only found in the nuclei of cells.
D) Amino acids are the building blocks for DNA molecules.
A) DNA’s code determines the amino acid sequence for building proteins.
Which statement describes the role sunlight plays in photosynthesis?
A Sunlight is released by the chloroplasts in the presence of carbon dioxide.
B Sunlight provides the energy to turn carbon dioxide and water into sugar molecules.
C Sunlight is absorbed by the chloroplasts and converted into carbon dioxide and water.
D Sunlight removes energy from carbon dioxide molecules, reducing them to sugar molecules.
B Sunlight provides the energy to turn carbon dioxide and water into sugar molecules.
What will most likely result from a cell failing to complete cytokinesis?
A It will remain one cell with the normal number of chromosomes.
B It will remain one cell with double the normal number of chromosomes.
C It will produce two cells, each with the normal number of chromosomes.
D It will produce two cells, each with double the normal number of chromosomes.
B It will remain one cell with double the normal number of chromosomes.
These graphs show the effects of temperature and pH on a certain enzyme found in the human digestive system.
See Graphs on Board
Which can best be concluded from the graphs?
The enzyme is most effective at 40°C and a pH of 8.
Which cellular structures are most directly involved with maintaining water balance in the
guard cells?
A nucleus and vacuoles
B cytoplasm and nucleus
C cell membrane and vacuoles
D chloroplasts and mitochondria
C cell membrane and vacuoles
Bacteria reproduces (sexual or asexual) reproduction and results in daughter cell being (identical or unique) from the parent cell.
Asexual and identical
Each gamete of a gorilla contains 24 chromosomes. Suppose the gorilla mates and produces an offspring. How many chromosomes will be in each of the offspring’s skin cells?
If you put a plant in salt water it will ...
A. swell because water diffuses into the cells
B. Nothing will happen
C. shrivel because water diffuses out of the cell
C. shrivel because water diffuses out of the cell
Select the 2 statments that best describe enzymes:
1. Enzymes are biological catalyst
2. Enzymes can only be used once in a reaction
3. Enzymes increase the amount of energy needed to start a reaction.
4. Enzymes are substrate specific
#1 and #4
A scientist investigates the connection between the waxy cuticle and guard cell behavior by manipulating the cuticle. The info below shows the results of the investigation.
Experimental Treatment Guard Cell Observations
no removal of the cuticle: Guard cells are full; stomata are open.
partial removal of the cuticle: Guard cells are partially slack; stomata are partially open.
full removal of the cuticle: Guard cells are fully slack; stomata are closed.
How does the cuticle affect the stomata?
Without the cuticle, the stomata close to conserve water.
Which choice best explains the formation of different cell types?
A) loss of genes during cell division
B) duplication of genes during replication
C) transcription of all genes in the chromosomes
D) activation of specific genes in the chromosomes
D) activation of specific genes in the chromosomes
A mutation occurs in a human skin cell. What would make this mutation a cause for concern?
A This type of mutation will change the cell type.
B The individual’s offspring will inherit the mutation.
C It can prevent the organism from producing normal muscle cells.
D It can cause overproduction of abnormal cells within the individual’s body.
D It can cause overproduction of abnormal cells within the individual’s body.
Which statement correctly describes the energy needs for photosynthesis and cellular respiration?
A)Solar energy is needed for cellular respiration but not for photosynthesis.
B)Chemical energy in the form of glucose is needed for both cellular respiration and photosynthesis.
C)Chemical energy in the form of glucose is needed for photosynthesis, and solar energy is needed for cellular respiration.
D)Solar energy is needed for photosynthesis, and chemical energy in the form of glucose is needed for cellular respiration.
D)Solar energy is needed for photosynthesis, and chemical energy in the form of glucose is needed for cellular respiration.
Which characteristic distinguishes bacteria from eukaryotic cells?
A the absence of ribosomes
B the presence of a cell wall
C the presence of circular DNA
D the absence of a plasma membrane
C the presence of circular DNA
The stomates would remain closed on a hot day to
A)allow gas exchange
B)prevent gas exchange
C)allow water loss
D)prevent water loss
D) prevent water loss
Blood cells lose their nucleus as they mature. How does this affect their function?
A) The cells can no longer move materials through their membrane.
B) The cells are able to produce proteins more quickly.
C) The cells have less space to store materials.
D) The cells can no longer complete cellular division.
D) The cells can no longer complete cellular division.
Cell membranes are described as selectively permeable.
explain what this means.
Water molecules move from an area of _______ concentration to an area of _____ concentration.
Cell membranes regulate which substances can enter and exit the cell.
High to Low
Jacob is studying plants and has learned these facts about plant tissues.
Phloem tissue is responsible for transporting food from the leaves to the stems and roots.
Xylem tissue is most often used to transport water from the roots to the stems and leaves. How will DNA activation affect the cell differentiation of phloem and xylem cells?
A) The gene for transporting water will be activated in xylem cells and deactivated in phloem cells.
B) The gene for transporting food will be activated in xylem cells and deactivated in phloem cells.
C) The gene for transporting water will be activated in both phloem cells and xylem cells.
D) The gene for transporting food will be activated in both phloem cells and xylem cells.
A) The gene for transporting water will be activated in xylem cells and deactivated in phloem cells.
Which amino acid sequence would result from the sequence CUC-AAG-UGC-UUC?
Leucine-Lysine-Cysteine-Phenylalanine
Which choice describes the following: Water is taken in by the roots of the plant. Excess water is then released through the open stoma during transpiration.
A) As the size of the vacuoles increases, the guard cells close and remain closed until the vacuoles decrease in size.
B As the size of the vacuoles decreases, the guard cells open and remain open until the vacuoles increase in size.
C As the size of the vacuoles increases, the guard cells open. As the size of the vacuoles decreases, the guard cells close.
D As the size of the vacuoles decreases, the guard cells open. As the size of the vacuoles increases, the guard cells close.
C As the size of the vacuoles increases, the guard cells open. As the size of the vacuoles decreases, the guard cells close.
A student placed a piece of onion tissue in a beaker containing a concentrated salt solution. After 5 minutes the student removed the tissue, placed it on a glass slide, and prepared it to be viewed under a light microscope. What will the student most likely observe about the cells that make up the onion tissue?
A The cells increased in size because they absorbed water from the beaker.
B The cells decreased in size because they absorbed water from the beaker.
C The cells increased in size because they released water into the beaker.
D The cells decreased in size because they released water into the beaker.
D The cells decreased in size because they released water into the beaker.
What effect would the absence of oxygen have on the processes that occur in the mitochondria?
A The mitochondria would begin making oxygen.
B The mitochondria would begin making glucose.
C The mitochondria would produce limited ATP.
D The mitochondria would prevent enzyme production.
C The mitochondria would produce limited ATP.
Which of the following would numerically represent what happens at the chromosome level during sexual reproduction?
A) n + n = 2n
B) 2n + 2n = 4n
C) n x n = n
D) 2n / 2n = n
A) n + n = 2n