What methods do angiosperms use to disperse seed?
What will be an ideal response?
Angiosperm seeds are spread via wind, water, ingestion of fruits by birds and animals, and hitching a ride on fur, feathers, and clothing.
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The Ames test is used to identify potential carcinogens. A compound tested resulted in a few scattered colonies growing on the media, similar to the control plate with no disk. What does this result imply?
A. The compound in the disk is so toxic that it inhibits almost all growth on the plate. B. The few colonies that grew are resistant to the compound. C. The few colonies that grew contain reversion mutations that allow them to grow on media without histidine. D. The compound in the disk is not mutagenic so there was no increase in the reversion rate. E. Either the compound in the disk is not mutagenic or the few colonies that grew contain reversion mutations.
The correct order of the basic steps of virus multiplication is ________
a. attachment, penetration, replication and then synthesis, assembly, and release b. attachment, penetration, replication and then synthesis, release, and assembly c. penetration, attachment, replication and then synthesis, assembly, and release d. attachment, penetration, assembly, replication and then synthesis, and release
Variation among individuals that is due to variation in factors other than environmental influences is called ________
A) phenotypic variation B) genetic variation C) broad-sense heritability D) narrow-sense heritability
If a toxin, such as a bacterial toxin, destroys ribosomes, what cellular activity will be affected first?
a. protein synthesis b. DNA synthesis c. movement d. energy storage e. active transport