Platelets are important in
A. the cellular immune response.
B. blood clotting.
C. transporting carbon dioxide.
D. inflammation.
E. All of the choices are correct.
Answer: B
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Which of the following is an organic
molecule?
a. carbon dioxide (CO2) b. water (H2O) c. methane (CH4) d. hydrochloric acid (HCl) e. more than one of these is an organic molecule
In skeletal and cardiac muscles, relaxation occurs as ________ ions are pumped back into the sarcoplasmic reticulum
A) potassium B) sodium C) chloride D) calcium
Before DNA was established as the genetic material, proteins were considered the most likely molecules to serve this role. In part this belief was based on the fact that there are 20 building blocks (20 different kinds of amino acids) for proteins versus
4 building blocks (4 different nucleotides) for DNA. If proteins stored a code, there would be a far greater number of code words possible for a protein of a given number of amino acids than for a DNA molecule of the same number of nucleotides. For example, there are 16 different sequences (42 ) possible for a DNA two nucleotides long and 400 (202 ) different sequences possible for a protein two amino acids long. For a sequence three nucleotides or three amino acids in length, the number of distinct DNA sequences is ________, and the number of distinct protein sequences is ________. A) 20; 420 B) 64; 8,000 C) 800; 8,000 D) 30; 800 E) 64; 800
Which is an example of temporal isolation?
A. Two plant species have incompatible gametes. B. Two plant species live on the same mountainside, but one lives on rocky outcrops and the other in open meadows. C. One plant species blooms in June-July, and a second plant species blooms in August-September. D. One plant species is pollinated by bees and a second plant species is pollinated by moths.