Which sentence describes the principle of independent assortment?
a. Genes on the same chromosome are always inherited together.
b. Two alleles for a single trait are randomly sorted to individual gametes; chromosomes are not mentioned.
c. Alleles on different homologous chromosomes are not randomly sorted to individual gametes.
d. Genes on the same
Answer: b. Two alleles for a single trait are randomly sorted to individual gametes; chromosomes are not mentioned.
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Growth of new blood vessels is stimulated by vascular endothelial growth factor (VEGF). This ligand binds to the VEGF receptor, which leads to the dimerization and autophosphorylation of this receptor on cytoplasmic tyrosines. What type of receptor is the VEGF receptor?
A. Channel-linked receptor B. Enzymatic receptor C. G protein-coupled receptor D. Steroid hormone receptor
When amino acid availability exceeds the needs of protein synthesis, ________
a. some amino acids are converted to urea and eventually eliminated in the urine b. the amino group can be removed and the carbon backbone metabolized for energy c. cells will make storage polypeptides in a way similar to glycogen formation d. all of the choices
If tossing a standard six-sided die with each side numbered 1 through 6, what is the probability of throwing a 2 or a 4 or a 5?
a. 1/3 b. 1/6 c. 1/2 d. 1/18
Nutrient recycling in an ecosystem begins with the
a. producers. b. lower level consumers. c. upper level consumers. d. decomposers. e. detritivores.