In eukaryotes, ____ regulation is the first level at which gene expression is controlled
a. transcriptional
b. translational
c. posttranscriptional
d. posttranslational
e. replicative
ANSWER: a
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A eukaryotic genome is defined as:
A. all of the DNA in a cell. B. a haploid set of chromosomes plus one copy of any organelle DNA present. C. a haploid set of chromosomes. D. a diploid set of chromosomes plus one copy of any organelle DNA present. E. a diploid set of chromosomes.
Which step is NOT involved in the fertilization of angiosperm flowers?
A. Pollen is transported to a stigma of a flower. B. When pollen reaches the stigma of a flower, it begins to grow a pollen tube that pierces the style. C. The style of the pistil contracts to bring the sperm closer to the embryo sac. D. The pollen tube grows until it reaches the ovule in the ovary. E. Double fertilization produces an embryo and the endosperm.
What is the most appropriate term for a mature pollen grain?
a. megaspore b. microspore c. male gametophyte d. female gametophyte e. immature sporophyte
Which statement reflects the age structure of these three countries?
a. India has the greatest proportion of older adults. b. The United States has the greatest proportion of young people. c. India has the greatest proportion of young people. d. China has the greatest proportion of young people. e. China has the greatest proportion of older adults.