A couple has four children; one is affected by SCD, and two are carriers of the disease. What can be said of the genotypes of the parents?
What will be an ideal response?
Both are heterozygotes.
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Which of the following statements best describes secondary endosymbiosis?
A. A host cell manufactures its own symbiont and later acquires another one by phagocytosis. B. A host cell ingests another cell already containing a primary symbiont. C. A host cell ingests two or more symbionts simultaneously. D. A host cell ingests one symbiont and then later ingests another one. E. All of the other choices provided are incorrect.
Why are molecular methods particularly useful for identification of microbes when they are difficult to grow?
A. While all microbes can (and should) be grown for identification purposes, sometimes it's simply faster to use a molecular technique. B. They AREN'T useful-growing a microbe is clearly the only way to properly identify it. C. Since all microbes use DNA, and we can sometimes detect and identify them through even very small amounts of their DNA, molecular methods allow us to identify microbes even when they can't be grown at all. D. Molecular methods are far cheaper methods than growing microbes for identification.
In pea plants, Y confers yellow peas and y confers green peas. If you cross two heterozygous Yy pea plants, what fraction of the offspring will be yellow?
A. 50% B. 100% C. 25% F. 0% E. 75%
During which growth phase will Gram-positive bacteria be most sensitive to penicillin?
a. lag phase b. log phase c. stationary phase d. equally sensitive in all phases