Answer the question using the accompanying figure. What is occurring in step 11?
a. cytoplasmic division
b. fusion
c. fertilization
d. the first meiotic division
e. the second meiotic division
ANSWER: a
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The amino acids valine and threonine differ only by the presence of a hydroxyl group or a methyl group
The aminoacyl-tRNA synthetases for tRNAVal and tRNAThr must discriminate between using these two very structurally similar amino acids as substrate for creating charged tRNAs. The discrimination by the Valyl-tRNA synthetase is by differential binding of valine and/or threonine to a first site on the synthetase and, then, differential binding to a second site on the synthetase. This is an example of what known process in the specificity of tRNA synthetases? A. adenylation B. kinetic proofreading C. wobble D. premature termination E. accommodation
Which of the following is NOT a step to calculate a coefficient of inbreeding?
A. Determine the mutation rate B. Determine the total number of common ancestors. C. Determine the shortest inbreeding path between the individual and the common ancestor. D. Calculate the inbreeding path for each common ancestor. E. Place values in the inbreeding coefficient formula.
The barrier between the intracellular and extracellular fluid compartments in an animal or plant is the:
A. plasma membrane. B. walls of capillaries. C. nuclear membrane. D. membrane of the endoplasmic reticulum. E. membrane of the Golgi apparatus.
Four of the five plants listed below are
heterosporous. Select the exception. a. angiosperms b. cycads c. ginkgo d. conifers e. ferns