Why are changes in the global carbon cycle important?
I) Burning reduces available carbon for primary producers and, therefore, primary consumers.
II) Deforestation and suburbanization reduce an area's net primary productivity.
III) Increasing atmospheric concentrations of carbon dioxide could alter Earth's climate.
IV) By using fossil fuels we are destroying a nonrenewable resource.
A) only I and III
B) only II and IV
C) only I, II, and IV
D) only II, III, and IV
E) only I, II, III, and IV
Answer: E
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Which of the following statements explains how N-formylmethionine (fMet) is incorporated only in response to the 5'-AUG initiation codon in E. coli, given that methionine has only one codon?
A. There is only one tRNA with the CAU anticodon. B. Only Met-tRNAmet can bind to a specific ribosomal entry site. C. The N-formyl group on methionine prevents fMet from entering interior positions in a polypeptide. D. fMet is always incorporated at interior AUG sites and then deformylated after translation.
________ uses a blastomere biopsy to obtain a cell to test for genetic and chromosomal abnormalities.
A) Cytoplasmic donation B) Intrauterine insemination C) Oocyte donation D) Preimplantation genetic diagnosis
In the chalk bass drift activity last week, which of the following caused drift to occur?
A. A bottleneck B. The law of independent assortment C. The founder effect D. Random donation of gametes to offspring
Which of the following is true about protein as an energy source?
a. Protein is more important than carbohydrate as an energy source for muscular activity. b. The use of protein as an energy source is greater for endurance athletes than for those who body build or lift weights. c. Protein and amino acid supplements are needed as energy sources for weight lifters. d. Protein is a good energy source, supplying 7 kcal per gram.