Less than 50% of which molecule is reabsorbed during tubular reabsorption?

A. amino acids
B. glucose
C. urea
D. sodium
E. water


Answer: C

Biology & Microbiology

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In early ancestors of the modern giraffe, longer necks allowed animals to reach higher tree branches as food.  This would lead to ____ in the ancestral giraffe population.  

A.  disruptive selection B.  directional selection C.  sexual selection D.  genetic drift E.  stabilizing selection

Biology & Microbiology

An unlabeled signaling diagram for steroid hormones: Fig. 11.8 p. 213, Campbell 8e. A steroid hormone, like estrogen, passes through the plasma membrane and binds to an intracellular protein as shown in the diagram below

This activates a signal-transduction pathway which results in an increased production of a specific protein. Which of the following statements would explain what would occur as a result of the signal pathway represented by the diagram? A) Transfer RNA (t-RNA) would accumulate in high levels because it is not required for protein synthesis. B) Ribosomal RNA (r-RNA) levels would increase because ribosomes are specific for the messenger RNA (m-RNA) with which they bind during transcription of the polypeptide. C) DNA levels would increase in the nucleus as a result of the binding of the hormone-receptor complex with the DNA. D) Messenger RNA (m-RNA) levels would increase in order to be translated into the protein required by the cell.

Biology & Microbiology

How successful an individual is at passing on its genes to the next generation is known as:

A) adaptation. B) microevolution. C) sexual selection. D) fitness. Read the statement below, and then answer the following question(s). A small population of deer is introduced to an island. All the males have 11 to 13 points on their antlers.

Biology & Microbiology

Which structure prevents blood flowing back into the atria during ventricular contractions?

A. foramen ovale B. semilunar valves C. atrioventricular valves D. carotid blood shunts E. sinoatrial node

Biology & Microbiology