In a dihybrid cross involving two autosomal traits on different chromosomes in which the parentals are purebred for the opposite forms of both traits, how many of the offspring would be expected to be homozygous recessive for both traits?
A) 1 out of 16
B) 3 out of 16
C) 6 out of 16
D) 9 out of 16
A
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The preprophase band is specific to plant cells, and:a
appears after mitosis begins. b. forms inside the nucleus. c. determines the plane of cell division d. is found in both plant and animal cells. e. is composed of cellulose
Which of the following statements correctly distinguishes between microevolution and macroevolution?
a. Macroevolution can lead to microevolution after a long period of time. b. Macroevolution occurs faster than microevolution. c. Macroevolution is limited to changes in allele frequencies without speciation. d. Macroevolution includes speciation, while microevolution does not. e. Microevolution occurs by a fundamentally different process than macroevolution.
Which of the following drugs are not matched correctly with their uses?
A) azoles: athlete's foot, ringworm, and yeast infections B) echinocandin drugs: systemic fungal infections in immune-compromised patients C) polyenes: cutaneous candidiasis caused by Candida albicans or treating life-threatening systemic fungal infections D) allyamines: systemic fungal infections like in coccidioidomycosis caused by Coccidioides immitis E) Flucytosine: administered in combination with amphotericin B for severe fungal infections such as Cryptococcus meningitis and systemic Candidiasis infections
A child may be given the vaccine for chickenpox. If the child goes to school and plays with other children who have the chickenpox virus, the vaccinated child will not get sick. Why is this?
A) Vaccines act like antibiotics so that any organism in the body will be destroyed before the immune system has to respond. B) Vaccines introduce a friendly virus into cells so they cannot be infected with a second virus. C) Vaccines produce a primary response in which memory cells are generated that respond rapidly in a second exposure. D) Vaccines stimulate macrophages to work extra hard to fight infections.