Genomic imprinting works by
A. blocking the cell's ability to read certain genes.
B. activating the DNA polymerases so thymine is more readily attached to the lead gene.
C. blocking the cell's ability to undergo cytokinesis.
D. activating the DNA ligases so they can clip the attached methyl groups off.
Answer: A
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The two major categories of extracellular signaling molecules that bind to cell surface receptors are ____
a. peptide hormones and steroid hormones b. steroid hormones and neurotransmitters c. neurotransmitters and vitamins d. growth hormones and vitamins e. peptide hormones and neurotransmitters
Suppose that in studies of genes on the same chromosome you find the following recombination frequencies: Why is the total distance between a and b less than the distance between a and c plus the distance between c and b?
a. a and b are not linked b. the distances were calculated incorrectly c. b is in between genes a and c d. double crossovers between a and b decrease recombinants e. all three genes encode the same trait
What has been learned from comparative genomics studies?
a. Similar genes in different organisms perform very different functions. b. Prokaryotic DNA has different nucleotide bases compared to eukaryotic DNA. c. Similar genes do not exist in different species. d. Some genes are present in the genomes of almost all present-day organisms. e. Different species can have identical genome sequences.
________ maintains seed dormancy, and ________ ends seed dormancy by stimulating enzymes that break down the food reserves of the seed to fuel seedling growth
A) Auxin; cytokinin B) Gibberellin; abscisic acid C) Abscisic acid; gibberellin D) Cytokinin; auxin E) Abscisic acid; ethylene