The first colonizers of bare rock are often:
a. angiosperms
b. lichens
c. mycorrhizae
d. sac fungi
e. zygote fungi
b
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The embryonic root, which is where the pollen tube enters the ovule prior to fertilization, is called the ____
a. suspensor b. epicotyl c. hypocotyl d. endosperm e. cotyledon
RNA interference (or RNAi) is a popular research tool used in biomedical research. It has great potential as it allows researchers to "knock down," or silence, genes of interest. For, example, it could be used to block expression of a gene that plays a role in a certain cancer. In the lab, researchers can design synthetic double stranded RNA that then binds the mRNA of interest and leads to its
destruction. Which mechanism within a cell also leads to mRNA destruction? Explain how this mechanism works. What will be an ideal response?
What happens when living R strain Streptococcus pneumoniae bacteria are mixed with heat-killed S
strain Streptococcus pneumoniae bacteria?
a. The S strain bacteria come back to life. b. The R strain bacteria are killed, and the S strain bacteria remain dead. c. The R strain bacteria are transformed into S strain bacteria. d. The S strain bacteria are transformed into R strain bacteria. e. The R strain bacteria are killed, and the S strain bacteria come back to life.
ParvovirusesA) cause diseases in cats, dogs, and humans.B) have a genome of double stranded DNA.C) are the cause of erythema infectiosum.D) have a nucleocapsid surrounded by an envelope.
What will be an ideal response?