Natural killer cells destroy target cells by:
a. releasing antibiotics, which break down the cell membranes.
b. releasing cytokines, perforins, and granzymes.
c. releasing histamine, which signals other blood cells to aggregate.
d. phagocytosis, after the cells are targeted by antibodies.
e. releasing lysosomal enzymes, which digest the target cells.
B
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Using the drawing of mRNA below, choose the letter that best fits the description. This region prevents rapid degradation of the mRNA transcript and is essential for translation. ____
What will be an ideal response?
Which term describes the front side of an animal displaying bilateral symmetry?
a. anterior b. posterior c. ventral d. dorsal
Which of the following statements below is an incorrect link in human gamete production?
A. Gametogenesis produces gametes in human testes and ovaries. B. Human eggs are produced by oogenesis in the ovaries. C. Meiosis to form eggs is only completed if an egg cell is fertilized. D. Human sperm are formed through spermatogenesis in the testes. E. Gametes form after meiosis, in the process of parthenogenesis.
When does the segregation of alleles occur?
A) Homologous chromosomes separate during meiosis. B) Homologous chromosomes separate during mitosis. C) Sister chromatids separate during meiosis. D) Sister chromatids separate during mitosis.