During the pre-embryonic period, a single sperm passes through the zona pellucida. In the vast majority of cases, where does this process occur?
A) in the uterus
B) in the ovary
C) in the oviduct (fallopian tube)
D) in the placenta
C
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Most Archaea capable of metabolizing glucose do so using a modified ________ pathway.
What will be an ideal response?
Which of the following does NOT produce
variation? a. crossing over b. random alignment of chromosomes during meiosis c. asexual reproduction d. genetic recombination of alleles e. sexual reproduction
Beadle and Tatum irradiated Neurospora and initially grew the mutant strains on complete medium. How were they
able to determine the type of mutation for each strain? a. By growing the mold on a complete medium with extra vitamins and nutrients b. By growing the mold on minimal media supplemented with different combinations of amino acids and vitamins c. By growing the mold in its diploid form to see which traits were masked d. By comparing Neurospora to other species of mold e. By observing the marked differences in morphology between the different strains
A certain unicellular eukaryote has a siliceous (glasslike) shell and autotrophic nutrition. To which group does it belong?
A) dinoflagellate B) diatom C) gymnamoeba D) foraminiferan E) cellular slime mold