During reproduction, angiosperms undergo a process known as double fertilization. During this process one sperm and egg combine to form the future embryo, while the other sperm fuses with the diploid nucleus to produce what?
a. stamen
b. pistil
c. endosperm
d. cotyledons
c. endosperm
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Macromolecules that are used by most organisms to store hereditary information are called:
A. proteins. B. transfer RNA molecules. C. ribosomal RNA molecules. D. DNA molecules. E. messenger RNA molecules.
One of the main safety guidelines of DNA research is that ________
a. the host organisms are all female b. the host organisms are all male c. the host organisms can only survive under a narrow range of laboratory conditions d. there were no guidelines e. the host organisms can only be purchased from certain laboratories
Which does a successful PCR require?
A) at least 100 starting DNA template molecules B) some sequence information about the region to be amplified C) a cloned cDNA of the region to be amplified D) a double-stranded DNA template of at least 100 kb to amplify E) an undamaged DNA template with intact chromosomes
Inherited mutations in the Xist promoter lead to defects in which epigenetic process?
A) RNAi B) X-inactivation C) genomic imprinting D) position effect variegation E) methylation of CpG islands