Cells and Tissues
The resting membrane potential of a cell is the consequence of which of the following concentrations of ions?
High K+ and Cl − outside the cell and high Na+ and large anions inside the cell
High K+ and Na+ outside the cell and high Cl − and large anions inside the cell
High Cl− and Na+ outside the cell and high K+ and large cations inside the cell
High Ca2+ and Na+ outside the cell and high K+ and large cations inside the cell
High Cl− and Na+ outside the cell and high K+ and large cations inside the cell
These ionic species are largely responsible for the membrane potential (cations are negative ions). While there is a higher concentration of Ca outside the cell than inside, there are fewer Ca than Cl ions.
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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 −70 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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