Cells and Tissues
What is the function of the cell plasma membrane?
It maintains an intracellular environment that is hypotonic compared to the extracellular fluid.
It protects the cell from dehydration by limiting water flow from the cell.
It regulates the passage of molecules and ions into an out of the cell.
It provides the supportive medium for membrane proteins.
It regulates the passage of molecules and ions into an out of the cell.
The plasma membrane is made of lipid and separates the aqueous intracellular fluid from the aqueous extracellular fluid. Substances cannot enter or leave the cell unless they are lipid soluble or by endo-/exocytosis or have a membrane protein pore or transport mechanism that can move them through the membrane.
It regulates the passage of molecules and ions into an out of the cell. The plasma membrane is made of lipid and separates the aqueous intracellular fluid from the aqueous extracellular fluid. Substances cannot enter or leave the cell unless they are lipid soluble or by endo-/exocytosis or have a membrane protein pore or transport mechanism that can move them through the membrane.
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What is the composition of the intercellular matrix in connective tissue?A. Cells and fibres
B. Serous and mucous membranes and lamina propria
C. Protein fibres and ground substance
D. Interstitial fluid
What is the function of phospholipids in the plasma membrane?
A. To maintain the intracellular fluid at a similar composition to that of the interstitial fluid
B. To form channels to selectively allow passage of small molecules
C. To act as receptors for signalling chemicals
D. To present a barrier to the passage of water-soluble molecules
The cell membrane’s resting potential (about โ70 mV inside with respect to the outside) is due mainly to which of the following mechanisms?
A. The sodium-potassium pump
B. The diffusion of cations and anions through the membrane along their concentration gradients
C. The diffusion of sodium and potassium across the cell membrane
D. The presence inside the cell of anions too large to passively cross the cell membrane
Which statement is true of the 23 chromosomes within a sperm?
A. 23 chromosomes is the diploid number.
B. 11 chromosomes came from the father, 11 chromosomes came from the mother, while one of either the Y or the X came from the father or mother, respectively.
C. Some of the 23 came from the father, and the rest came from the mother.
D. 11 chromosomes and the Y came from the father, while 11 chromosomes came from the mother.
Adipocytes are found in which type of tissue?
A. Muscle tissue
B. Epithelial tissue
C. Nervous tissue
D. Connective tissue
If the DNA strand sequence of bases is CTT AGA CTA ATA, what would the tRNA read?
A. GAA TCT GAT TAT
B. CUU AGA CUA AUA
C. GAA UCU GAU UAU
D. GUU ACA GUA AUA
Which one of the following statements best describes DNA?
A. Single-stranded, deoxyribonucleic acid
B. Single-stranded, ribonucleic acid
C. Double-stranded, deoxyribonucleic acid
D. Double-stranded, ribonucleic acid
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