will rep every1 who helps
1) An active vaccination can be achieved by administering a solution containing
B) horse erythrocytes.
C) B cells.
D) a harmless variant strain of a disease-causing microbe.
2) Antibodies are
A) amino acids.
E) nucleic acids.
3) Which of the following cell types is specifically responsible for humoral immunity?
A) C lymphocytes
B) B cells
D) natural killer cells
4) What is the primary immune response?
A) the production of primary-type antibody in the first day of exposure to a microorganism
B) the immune response elicited by the primary antigen of a disease-causing microorganism
C) the immune response elicited by the primary antibody of a disease-causing microorganism
D) the immune response elicited by the first exposure of lymphocytes to a particular antigen
E) the immune response elicited by the first exposure of memory cells to a particular antigen
5) Which of the following by-products of metabolism is the most toxic?
A) carbon monoxide
D) carbonic acid
E) lactic acid
6) What is the main component of the white material in bird droppings?
C) lactic acid
D) sodium chloride
E) uric acid
7) Which of the following kinds of animals excrete their nitrogenous waste entirely as ammonia?
B) tropical insects
D) garden snails
8) What is the advantage of excreting nitrogenous waste in the form of ammonia?
A) Ammonia is less toxic than uric acid.
B) Ammonia is less soluble than uric acid.
C) Ammonia excretion conserves energy.
D) Ammonia does not diffuse across cell membranes.
E) Ammonia contains more nitrogen atoms per molecule than uric acid.
9) Which of the following is not a function of the excretory system?
A) elimination of nitrogenous wastes
B) maintenance of salt balance
C) elimination of undigested foods
D) maintenance of water balance
E) production of urine
10) What is the function of urea reabsorption in the collecting ducts of the kidney?
A) It restores the correct concentration of blood urea.
B) It increases the osmotic concentration of the interstitial fluid in the renal medulla so that more water can
be extracted from the urine.
C) It reduces the salinity of the renal medulla and thus helps regulate how much water is reabsorbed from
D) It induces NaCl to move into the capillaries and thus helps maintain blood salinity.
E) The urea enters the ascending limb of the loop of Henle and from there is excreted in the urine.
11) What is the name of the functional unit of the kidney?
A) renal unit
B) Bowman's capsule
12) Which of the following lists structures in the order in which fluid flows through them?
A) proximal tubule, Bowman's capsule with glomerulus, loop of Henle, distal tubule, collecting duct
B) Bowman's capsule with glomerulus, proximal tubule, distal tubule, loop of Henle, collecting duct
C) Bowman's capsule with glomerulus, distal tubule, loop of Henle proximal tubule, collecting duct
D) Bowman's capsule with glomerulus, proximal tubule, loop of Henle, distal tubule, collecting duct
E) Proximal tubule, distal tubule, Bowman's capsule with glomerulus, collecting duct, loop of Henle
13) Through which of these structures is urine transported to the bladder?
C) renal artery
D) renal medulla
E) distal convoluted tubule
14) Secretion is the movement of substances from the __________ to the __________.
A) nephron tubule . . . glomerulus
B) filtrate . . . blood
C) glomerulus . . . nephron tubule
D) blood . . . filtrate
E) urinary bladder . . . outside
Thread: bio help; easy REPS! (serious)