All of the following problems are direct results of human impact on the nitrogen cycle except:a
photochemical smog.
b. global warming.
c. acid rain.
d. El Niño-Southern Oscillation events.
e. depletion of the ozone layer.
D
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Maternal messages in the form of mRNA is
distributed during
a. zygote formation. b. gastrulation. c. cleavage. d. neurulation. e. blastulation
Which of the following hormones is NOT
related to sexual reproduction?
a. GnRH b. ACTH c. LH d. FSH e. all of these are hormones related to sexual reproduction
Crossing over is important because it
1.eliminates a bad allele from being in an egg or sperm cell. 2.increases the variation in the DNA of eggs and sperm. 3.increases the number of alleles in the eggs and sperm. 4.changes the alleles for traits on a chromosome.
When is the human T lymphotropic virus typically detected in a patient?
A) Patient develops cancer or donates blood. B) Typically screened for when memory loss symptoms present C) The sores that develop in stage 2 give it away. D) Initial symptoms of infection are a clear indicator. E) It can only be detected postmortem.