A powerful way to demonstrate that observed differences between a treatment group and a control group truly reflects the effect of the treatment is for researchers to:
A) get their study published in a scientific journal.
B) use a variety of statistical tests until they find one that shows statistical significance.
C) conduct the experiment over and over again.
D) make more observations.
E) formulate as many hypotheses as possible
C) conduct the experiment over and over again.
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Amplification of chromosomal DNA from a single-cell is accomplished by
A) randomly initiating DNA replication throughout the chromosome. B) creating thousands of primers that will prime DNA replication throughout the chromosome. C) creating complementary DNA from transcripts of a single-cell. D) cloning fragments of the chromosome from the single-cell into a multi-copy plasmid.
Which structure was least likely to be present in the charophyte ancestors of land plants?
a. spores b. gametes c. multicellular organs d. diploid embryos e. chloroplasts
The cuticle is derived from ________
a. cell divisions of parenchyma cells b. secretions of mesophyll cells c. secretions of epidermal cells d. cell divisions of apical meristem
Impressive was a champion Quarter Horse stallion with a magnificent muscular physique, a trait that he passed on to dozens of offspring. However, many of Impressive's offspring developed periodic muscular twitching that sometimes left the horses temporarily unable to move. Some horses even died. As it turns out, Impressive's award-winning physique was due to a mutation in a single, protein-encoding gene, resulting in hyperexcitable muscle (which contracts even in the absence of a stimulus from its motor neuron). Which is NOT a plausible explanation for the identity of the abnormal muscle protein in Impressive and his offspring?
A. tropomyosin that is unable to bind to actin B. acetylcholine receptors that function in the absence of acetylcholine C. over-active troponin molecules D. leaky Na+ channels E. overactive Ca2+ pumps in the membrane of the sarcoplasmic reticulum Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you know about excitation of muscles? What other information is related to the question? Choose Answer · Given what you now know, what information is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?