How do birth control pills prevent fertilization?
A. They alter the uterine environment so that sperm cannot survive.
B. They prevent follicle development and ovulation.
C. The provide hCG, indicating that fertilization has already occurred.
D. They inhibit menstruation.
E. They prevent implantation.
B. They prevent follicle development and ovulation.
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A gram-positive bacillus, which grew on Tinsdale agar, is esculin hydrolysis–negative, urease-positive, and nonlipophilic. The organism can be identified as:
a. C. diphtheria. b. Corynebacterium glucuronolyticum. c. Corynebacterium xerosis. d. Corynebacterium ulcerans.
Two genes (A and B) are located on each of two pairs of homologous chromosomes. In a tetrad, one sister chromatid
contains alleles ab, while the other sister chromatid contains alleles AB (upper and lower case indicate different alleles of the same gene). Which genetic combinations are possible in the four gametes that are produced from a single chiasma between these chromosome pairs?
a. Ab, AB, ab, aB b. Ab, Ab, aB, aB c. Aa, Bb, ab, Ab d. Ab, Ab, AB, AB e. AB, AB, ab, ab
If a reaction absorbs free energy it is termed which of the following?
a. exergonic reaction b. endergonic reaction c. metabolic reaction d. bioenergetic reaction
Restriction endonucleases are obtained from various species of bacteria.
Answer the following statement true (T) or false (F)