An organism that cannot tolerate any oxygen gas in its environment is a(n)
A. obligate anaerobe.
B. facultative anaerobe.
C. obligate aerobe.
D. microaerophile.
E. aerobe.
Answer: A
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From what feature are jaws through to have
evolved? a. pharynx b. vertebrae c. legs d. arms e. gill arches
Name the indicated structure in this image of a sperm
1.acrosome
2.flagellum
3.mitochondria
4.nucleus
The placental blood vessels
A) manufacture hormones that slow the growth of the embryo, preventing it from outgrowing the uterus. B) allow for the exchange of wastes and nutrients but keep the maternal and fetal circulations separate. C) draw oxygen from the fetal blood and pass it to the mother. D) mix maternal blood and fetal blood. E) prevent all microbes and toxins from crossing from mother to child.
What meiotic process, relative to the number of chromosomes of a given species, accounts for a significant amount of genetic variation in gametes?
A) trivalent formation B) formation of the meiotic spindle during chromosome segregation C) independent assortment of chromosomes D) bivalent formation E) pairing of homologous chromosomes