You work for a company that manufactures food products. A new "wonder food" is being distributed by a rival company. The researchers in your company determine that the "wonder food" contains only carbon, oxygen, and hydrogen. At this point, your
researchers can say with certainty that the food
A) includes proteins.
B) could only be made of triglycerides.
C) could only be made of carbohydrates.
D) does not include proteins or nucleic acids.
Answer: D
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The filtrate moves out of the glomerular capsule to the ________ and then to the loop of the nephron
A) proximal convoluted tubule B) juxtaglomerular apparatus C) collecting duct D) renal pelvis
A vertebrate hair cell usually contains one long stereocilium
____________________ Indicate whether the statement is true or false.
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.
When the energy flow through an ecosystem is measured at each trophic level, ________ of the available energy passes from one level to the next.
A. 1% to 2% B. 5% to 20% C. 25% to 35% D. 36% to 45% E. 46% to 55%