In photosynthesis, the oxygen atoms present in CO2 end up _____.
a. as molecular oxygen and water
b. in sugar molecules and carbon dioxide
c. in water and carbon dioxide
d. as molecular oxygen and in sugar molecules
e. in sugar molecules and in water
Answer: e. in sugar molecules and in water
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When atmospheric carbon dioxide concentrations decrease, the ________ cycle gives C4 plants an advantage over C3 when it comes to fixation.
Fill in the blank(s) with the appropriate word(s).
In transcription,
a. several proteins can made from the same DNA molecule. b. promoters are at the beginning of a gene. c. messenger RNA is produced. d. a specific enzyme called RNA polymerase is required. e. all of these are true.
Gastrulation produces
a. hollow balls of cells. b. embryos with primary tissue layers. c. solid balls of cells. d. maternal messages. e. all of these.
A hypothetical condition in some domesticated fowl is identified phenotypically by patchy loss of feathers on the animals' backs
Although several factors, genetic and environmental, are found to be involved, only about 3% of any population with any of these factors are found with feather loss. Which of the following is a likely cause? A) continuous variation B) threshold of liability C) low mutation frequency D) high number of alleles in one of the genes E) high number of environmental effects