There are several problems associated with the use of new GMOs. One of which is ________
A) the yields from the genetic modification may not be useful in the field
B) the GMO could prove dangerous for human consumption
C) the ecological impact is well known
D) the ecological impact is largely unknown
Answer: D
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An envelope
(a) surrounds the nucleus. (b) surrounds mitochondria. (c) consists of two membranes. (d) does all of the above.
In some cases, just a few hormone molecules binding to the surface of a cell can trigger a very large response because ____.
A. the signal is amplified by activation of transcription factors that each catalyze multiple reactions B. each hormone can bind to multiple receptors simultaneously causing amplification of the signal C. the signal is amplified by activation of enzymes that each catalyze multiple reactions D. each hormone can bind to transcription factors simultaneously causing amplification of the signal E. the hormone triggers the cell to release more hormones, amplifying the signal
The primary consumers in natural communities
are a. herbivores. b. carnivores. c. scavengers. d. decomposers. e. all of these
Which of the following is not true about meristems?
A. Apical meristems give rise to three types of embryonic tissues. B. Meristematic cells are found only in eudicots and not in monocots. C. They can be apical or lateral. D. Meristematic cells divide into two cells, one of which remains a meristem cell and another that becomes a plant body cell. E. They are responsible for primary and secondary growth.