Ribozymes are ____
a. RNA catalysts
b. proteins that catalyze RNA synthesis
c. RNA molecules that slow the rate of protein synthesis
d. the products of RNA degradation
e. amino acids that catalyze RNA synthesis
ANSWER: a
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The majority of an individual fungus lives "in" its food source. What characteristics of the fungal growth form make this a necessity?
A. Fungi have a high ratio of surface area to volume and are highly susceptible to dessication. B. Fungi have a low ratio of surface area to volume and are highly susceptible to dessication. C. Fungi require the stimulus of "pushing" through the substrate to stimulate growth. D. Fungi require more nutrients than other organisms, and large amounts of nutrients can only be acquired by living in a host.
For glycolysis to continue in eukaryotes, NAD+ must be regenerated. In anaerobic environments, this is accomplished by ________, which produces ________ as the end product(s)
a. fermentation / ethanol or lactic acid b. hydrogenation / NADPH c. phosphorylation / ATP d. an exchange reaction / FADH2 and NAD+
Answer the following questions true (T) or false (F)
1. Root hairs develop into taproots. 2. Stomata allow carbon dioxide into a leaf and water vapor out. 3. Most stomata are found on the top surface of a leaf.
Scientists believe that the heart of the common (chordate) ancestor of all vertebrates
A. consisted of a single ventricle. B. had three chambers. C. had two chambers. D. had four chambers. E. was little more than a heavily-muscled region of the ventral artery.