The scientist who made variolation safer and more effective was
A. Pasteur.
B. Jenner.
C. Metchnikoff.
D. Fleming.
B
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The finding that homeotic genes are present in both mammals and insects indicates that these genes must
A. control the same traits. B. be on the same chromosomes. C. have arisen very early in the evolutionary history of animals. D. have developed independently and simultaneously. E. have been transmitted into mammals by an insect bite. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you already know about homeotic genes? Consider Possibilities · Consider the different answer options. Which can you rule out? Choose Answer · Given what you now know, what information and/or problem solving approach 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?
Genes under positive control are ____
a. off until they are turned on b. always expressed
c. expressed unless a repressor protein is present d. controlled by several promoters to increase transcription e. regulated by feedback inhibition
White wheat flour is made from the tissue within the wheat kernel that nourishes the developing wheat embryo. What is this tissue called?
A) endosperm B) embryo C) carpel D) stamen
A temperate virus is one that will first:
A. Avoid the lysogenic cycle B. Enter the lytic cycle C. Lie dormant or cause a latent infection as it enters the lysogenic cycle D. Cause apoptosis E. Immediately lyse the cell upon entry and replication