Which extraembryonic membrane accumulates fetal urine?
A) chorion
B) yolk sac
C) allantois
D) amnion
Answer: C) allantois
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In many groups of fungi, karyogamy and plasmogamy are separated in time and space. One potential advantage of this arrangement is that:
A. mating and spore production can occur in different environments. B. a diploid nucleus can form immediately. C. spores can be produced by meiosis instead of mitosis. D. the fungus can easily switch between sexual and asexual reproduction. E. the mycelium can grow more rapidly.
Many algal species have life cycles consisting of alternating haploid and diploid generations. The most
common life cycle in green algae consists of organisms that are
a. unicellular in the haploid stage and multicellular in the diploid stage. b. multicellular in the haploid stage and unicellular in the diploid stage. c. unicellular in both the haploid and diploid stages. d. multicellular in both the haploid and diploid stages. e. colonial in both the haploid and diploid stages.
How do microtubules separate chromosomes during anaphase?
a. Microtubules pull chromosomes to opposite poles of the cell. b. Microtubules push chromosomes to opposite poles of the cell. c. Microtubules push and pull chromosomes to separate poles of the cell. d. Microtubules attach to telomeres and pull chromosomes to opposite poles of the cell. e. Microtubules attach to telomeres and push chromosomes to opposite poles of the cell.
A biology student takes fish, algae, pond plants, invertebrates, and bottom sediment from a local pond and establishes them in an aquarium. When the system is stable, the student seals it into a large, airtight glass box and leaves the box in a sunny
location. After 3 months, the organisms in the aquarium appear alive and healthy. Which statement about the experiment is true? A) No energy has entered or left the glass box during the 3 months. B) Some of the energy in the system has moved from one organism to another during the 3 months. C) The air in the glass box contains no carbon dioxide. D) During the 3 months, the biomass of animal life was greater than the biomass of plant life.