What are the two types of beta sheets?
A.) helical and pleated
B.) primary and secondary
C.) soluble and insoluble
D.) parallel and antiparallel
Ans: D.) parallel and antiparallel
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In the tuberculin skin test, what would be the most likely reason why a positive test would NOT necessarily indicate an infection in progress in a patient who was born and grew up in the United States?
A. False-positives occur all the time. This might simply be an example of that. B. The TB skin test is a measure of reactivation of memory T cells. The memory T cells would be formed either during an active infection or would be remnants of a prior infection that may be cleared. Since the memory of the response persists, the test still shows positive, even though the patient is cleared of actual infection. C. Each person in the United States receives the BCG tuberculosis vaccine. This is an attenuated mycobacterium vaccine. The response to this vaccine makes us positive for the TB skin test, even though we may not have actually had a TB infection at any point in our lives. D. A positive TB skin test ALWAYS indicates a current, active infection.
What technology using bacteria is used to
genetically engineer plants?
a. plasmid vectoring b. DNA profiling c. whole genome sequencing d. SNPing e. PCR
When your mother is mad at you, she likes to remind you that she spent 48 hours in painful labor to bring you into the world! Specifically, she means that she spent a long time in the ________ stage of labor
A) expulsion B) dilation C) third trimester D) placental
Which statement about living organisms is NOT correct?
(a). Living organisms create energy. (b). Living organisms maintain homeostasis. (c). Living organisms reproduce. (d). Living organisms have adaptations. (e). Living organisms grow and develop.