Comparing DNA or RNA samples from two different organisms to identify differences in gene expression is known as ________
A) RT-PCR
B) differential display PCR
C) DNA sequencing
D) random PCR
E) library screening
B
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Comparison of mitosis and cytokinesis in animal versus plant cells reveals ____
a. sister chromatids are identical in animal cells, but they differ from one another in plants b. a cleavage furrow is initiated in an animal cell, while a cell plate begins to form in plant cells during telophase c. in animal cells, chromosomes do not become attached to the spindle until anaphase, whereas chromosomes become attached to the spindle at prophase in plant cells d. the nuclear envelope disintegrates in prophase in animal cells, but remains intact in plant cells e. There are no differences between animal and plant cells.
Melatonin regulates
a. heart rhythms in song birds. b. the stimulation of cancer cell growth in humans. c. the menstrual cycle in human females. d. sleep cycles in humans. e. milk production in mammals after giving birth.
An organism that carries a disease between hosts is a
A. parasite. B. predator. C. vector. D. All of these answers are true.
Some mutations do not affect an organism's phenotype. Other mutations cause minor changes, and still others cause major changes. Which is most likely to cause a major change in an organism's phenotype?
A) a substitution of a single base B) an insertion of three consecutive bases C) the deletion of one arm of a chromosome D) a deletion of two bases at the end of a gene