Which of the following is useful in biological systematics?
A. Epidemiology
B. Ecology
C. Physiology
D. All of the choices are correct.
Answer: D
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Which of the following statements is not true of proteins destined for the ER?
A) They have a signal sequence. B) The signal sequence for the ER consists of 15-30 amino acids. C) The proteins are modified with carbohydrates in the ER. D) The signal sequence is subsequently removed from the mature protein. E) The SRP binds to the protein and prevents entry into the ER until translation is completed.
Which abiotic factor in the illustration would limit the carrying capacity of this environment for fresh water snails in the pond?
A) number of plants growing along the pond's banks B) population of birds C) concentration of algae in the upper levels of the pond D) amount of sunlight reaching the pond
Albumin is the large protein molecule found in egg white and blood plasma. Table salt dissociates into sodium and chloride ions. Urea is assembled in the liver. In a healthy person, what is the fate of the majority of these molecules as they pass through a nephron?
A. Albumin remains in the blood, salt ions move into the filtrate but most are reabsorbed, and the urea moves into the filtrate and is excreted in the urine. B. Albumin remains in the blood and salt ions and urea moved into the glomerular filtrate and excreted in the urine. C. All three move into the glomerular capsule but the salt ions are mostly reabsorbed. D. All three remain in the bloodstream. E. All three move into the glomerular capsule and are excreted in urine.
In humans, aneuploidy is fairly common yet goes largely unrecognized as a genetic problem. This is because:
A) it actually produces healthy individuals. B) it produces autosomal recessive individuals who don't always express the disorder. C) its effects are usually hidden. D) it often results in miscarriage of embryos.