Diazotrophs are obligately symbiotic bacteria that fix N2 into ammonia, thus providing a critical source of nitrogen to their host
Indicate whether the statement is true or false.
Answer: FALSE
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The phenotype of a person with alpha thalassemia depends on the
A) number of beta globin genes. B) presence or absence of a sickle cell mutation. C) number of alpha globin chains. D) rate of replication of the alpha globin genes.
How does the discovery of a past geological event that divided a once-continuous salt marsh in Florida support the tree depicted?
A. It supports the concept of allopatric speciation via vicariance. B. It does not support the tree depicted because there are six groups, not two. C. It does not support the tree depicted because the DNA sequence difference between the species is only one percent. D. It supports the concept of allopatric speciation via dispersal.
The phylum Nematoda includes which of the following very common organisms, some of which are parasitic and most of which are often found in soil?
A) Flatworms B) Earthworms C) Segmented worms D) Roundworms E) Tapeworms
The birth of a baby and milk production are synchronized. Babies can be born several months prematurely, and milk production is needed immediately after birth. How has the human body evolved to coordinate this delicate timing of events?
A. The hypothalamus and pituitary that triggered the female reproductive cycle also schedule milk production on a nine-month clock basis. B. ADH produced by the baby passes through the placenta and, added to the mother's ADH, builds up her milk production relative to the size of the fetus. C. The ovaries signal the rest of the body tissues by varying the level of estrogen. D. Conscious awareness of the arrival of a baby triggers the mother's hypothalamus to secrete prolactin. E. Oxytocin causes both the uterus to contract in labor and the release of milk from mammary glands, which is reinforced by prolactin from the pituitary.