Less than 50% of which molecule is reabsorbed during tubular reabsorption?
A. amino acids
B. glucose
C. urea
D. sodium
E. water
Answer: C
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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
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.
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.
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