Which one of the following is NOT a way that invasive (alien) species are introduced into a new habitat?
a) unintentionally introduced during transport of crops
b) intentionally introduced by humans
c) unintentionally introduced in packaged, processed foods
d) unintentionally introduced during discharge of ship ballast tanks
e) natural introductions on the feet, wings, or fur of migrating organisms
Ans: c) unintentionally introduced in packaged, processed foods
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For most multicellular eukaryotes, including humans, mitochondria are inherited ____
a. only from the father b. from both the father and the mother c. from the mother for female offspring and from the father for male offspring d. randomly from either the father or the mother e. only from the mother
Which of the following elements is considered an essential micronutrient for plants?
a. gold b. carbon c. uranium d. nitrogen e. copper
Why is cartilage important in sharks, rays, and skates?
A) it works as a respiratory structure B) it circulates blood flow C) it supports and gives structure D) it helps with digestion
An antibiotic is given repeatedly to treat a recurrent ear infection. It worked initially but now is no longer effective. This indicates that the Streptococcus bacterium
A) is very sensitive to the antibiotic. B) is being treated with an antibiotic that has experienced a manufacturing error, making it infective. C) is infectious only if it is sensitive to the antibiotic. D) experienced natural selection that has allowed the resistant Streptococcus to survive and multiply.