Answer the following statements true (T) or false (F)
1. The complement strands of DNA have the same exact nitrogen base sequence, providing the semiconservative replication needed by cells.
2. Any change in a cell's DNA sequence is a mutation.
3. Change in a cell's DNA sequence is a common occurrence in the process of replication.
4. Each newly replicated molecule of DNA contains one conserved strand from the original DNA molecule.
5. A replicated chromosome consists of two sister chromatids.
1.FALSE
2.TRUE
3.FALSE
4.TRUE
5.TRUE
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Plant hormones can have different effects at different concentrations. This explains how _____
A) some plants are long-day plants and others are short-day plants B) signal transduction pathways in plants are different from those in animals C) plant genes recognize pathogen genes D) auxin can stimulate cell elongation in apical meristems, yet will inhibit the growth of axillary buds E) gibberellin concentration can both induce and break dormancy
Your friend found out that the soybeans her grandfather planted were genetically modified to be resistant to the herbicide Roundup. She wants to know what “genetically modified” means. You tell her that:
1.Scientists created the seeds for the soybeans and other genetically modified organisms in the laboratory. 2.Genetically modified organisms are produced by making changes to an organism’s DNA to produce a desired product such as pesticide resistance. 3.Genetic modification is a technical term that refers to the process of cross-breeding plants until the desired trait is achieved. 4.The entire genome of the soybean has been mapped, so her grandfather has chosen a variety that is resistant to the herbicide Roundup.
Protists are alike in that all are
A) multicellular. B) photosynthetic. C) marine. D) nonparasitic. E) Eukaryotic
There are some similarities between prokaryotic and eukaryotic cells. Which of the following structures is found in both prokaryotic and eukaryotic cells?
A. lysosome B. mitochondrion C. nucleus D. ribosome