The human population is growing exponentially largely due to
a. higher birth rates
b. all of the above
c. improved medical treatments and care
d. available resources
e. lower death rates
Answer: b. all of the above
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Cloning of plants from cuttings demonstrates that _____
A) an individual plant cell cannot de-differentiate and then redifferentiate B) differentiated plant cells may contain embryonic mRNAs C) plants lose genetic information in the differentiation process D) mature plant cells retain the full genetic information needed to carry out the developmental processes to produce a new individual plant
The results of an experiment
(a) don’t have to be repeatable. (b) should be repeatable by the investigator. (c) should be repeatable by other investigators. (d) must be both b and c.
How do anoxygenic phototrophs benefit from possessing accessory pigments that allow light to be harvested at deeper areas of a fluid environment?
A. This allows even anaerobic microbes to conduct photosynthesis, as they can harvest light energy in the deeper areas where oxygen won't be present. B. The cells can use wavelengths of light that havenotbeen absorbed (filtered out) by the photosynthetic organisms closer to the surface of the fluid. C. They don't have to compete with other cells that utilize oxygen in the upper levels for the scarce nutrients in the fluid environment. D. This allows even anaerobic microbes to conduct photosynthesis, as they can harvest light energy in the deeper areas where oxygen won't be present AND can use wavelengths of light not absorbed (filtered out) by the photosynthetic organisms closer to the surface of the fluid. E. This allows even anaerobic microbes to conduct photosynthesis, as they can harvest light energy in the deeper areas where oxygen won't be present, use wavelengths of light not absorbed (filtered out) by the photosynthetic organisms closer to the surface of the fluid; AND don't have to compete with other cells that utilize oxygen in the upper levels for the scarce nutrients in the fluid environment.
Fossils show that this animal lived in the dark ocean. Each animal had a disc or a holdfast to attach it to the deep ocean floor.