Which of the following describes a process that involves viral replications and assembly within a host, followed by bursting the host cell wall?
A. Lysogenic cycle
B. Prophage
C. Replication
D. Lytic cycle
E. Living
Ans: D. Lytic cycle
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Which of the following statements about the corpus luteum is false?
A. The corpus luteum is maintained first by FSH and then by hCG. B. It is composed of follicle cells that remain in the ovary following ovulation. C. Progesterone secreted by the corpus luteum maintains the uterine lining. D. If the egg is not fertilized then the corpus luteum degenerates. E. None of the answer options is false.
The inheritance patterns of genetic material that is not contained in the nucleus of the cell is called _______
A. extranuclear inheritance B. maternal effect C. imprinting D. nuclear E. epigenetic
Normal diploid somatic (body) cells of the mosquito Culex pipiens contain six chromosomes. Assign the symbols AmAp, BmBp, and CmCp to the three homologous chromosomal pairs
The "m" superscript indicates that the homolog is maternally derived; the "p" indicates a paternally derived homolog. Assume that in the genus Culex, the sex chromosomes are morphologically identical. (a) For each of the cell types given below, draw and label (with reference to the symbols defined above) an expected chromosomal configuration. mitotic metaphase metaphase of meiosis I metaphase of meiosis II (b) The stage at which "sister chromatids go to opposite poles" immediately follows which of the stages listed in (a)? (c) Assuming that all nuclear DNA is restricted to chromosomes and that the amount of nuclear DNA essentially doubles during the S phase of interphase, how much nuclear DNA would be present in each cell listed in part (a)? Note: Assume that the G1 nucleus of a mosquito cell contains 3.0 × 10-12 grams of DNA. (d) Given that the sex of Culex is determined by alleles of one gene-males heterozygous, Mm, and females homozygous, mm–illustrate a labeled chromosomal configuration (involving the symbols AmAp, BmBp, and CmCp and the M locus) in a primary spermatocyte at metaphase. Assume that the M locus is on the AmAp chromosome and that crossing over has not occurred between the M locus and the centromere.
Secretory IgA act protects the mucous membranes by:
A. Acting as an opsonin (a substance that mark the target for phagocytosis) B. Activating the helper T-cells C. Interfering with the adherence of the microbe to the mucous membrane D. Killing the invading microbe