The innermost layer of the root cortex, which is a selectively permeable barrier that helps control the
movement of water and dissolved minerals, is called the
a. endodermis.
b. root cap.
c. quiescent center.
d. pericycle.
e. root hairs.
A
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Plant hormones generally ____ concentrations to be effective, and usually have ____ on different plant tissues
a. are effective only in extremely large; the same effect b. require only low; different effects c. require only low; the same effect d. are effective only in extremely large; different effects e. require moderate; the same effect
Substrate-level phosphorylation ____
a. occurs during glycolysis b. requires the presence of oxygen c. is a precursor for the phosphorylation of glucose d. is the source for the majority of the ATP produced in aerobic respiration e. occurs in the mitochondria
Three of the following statements are correct. Identify the statement that is not correct regarding genetically modified organisms
A) There are no risks associated with GM crops. B) GM crops have been produced with increased nutrition. C) GM crops have been produced that are disease resistant. D) GM animals are not in our food supply.
An individual receives a flu vaccine and is well protected for the current flu season. The following flu season, the individual fails to get another flu vaccine and comes down with the flu
What is the most likely explanation for vaccine ineffectiveness in the subsequent flu season? A) Antibiotic-resistant bacteria were able to overcome the effects of the vaccine. B) The immune system becomes weaker when continually exposed to the same virus contained in the vaccine. C) The flu virus mutated, leading to a new strain of virus that could escape detection by the immune system. D) Most vaccines have a limited lifetime and eventually break down and become ineffective.