Why is it unlikely that DNA was NOT the first
self-replicating molecule of life?
a. nitrogen is essential for constructing DNA
and there was no nitrogen on early Earth
b. DNA is hyper-sensitive to oxygen and
would have disassembled quickly in its
presence
c. DNA requires proteins like DNA
polymerase for assembly so it doesn’t truly
“self-replicate”
d. it must have RNA to self-replicate and
RNA evolved much later in life’s history
e. more than one of these is correct
C
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The adrenal cortex produces ____
a. aldosterone b. epinephrine c. ADH d. testosterone e. glucagon
Hominids evolved when the climate was
a. wet and hotter. b. wet and cooler. c. dry and hotter. d. dry and cooler. e. none of these
One reason that malaria continues to be the world's most significant infectious disease is because Plasmodium falciparum continues to develop resistance to the drugs that have been used to treat malaria. This is due to which of the following?
a. Some Plasmodium falciparum have pre-existing mutations that make them resistant to antimalarial drugs b. Some mosquitoes have pre-existing mutations that make them resistant to antimalarial drugs c. Some people have pre-existing mutations that make them resistant to antimalarial drugs d. The antimalarial drugs cause mutations to occur in Plasmodium falciparum e. The antimalarial drugs cause mutations to occur in the mosquito
In order to disperse water throughout themselves more effectively, plants evolved
A. pores. B. high pressure in their roots. C. circulatory systems. D. vascular systems.