A possible reason why humans have fewer genes than the number anticipated by scientists is that
a. humans don’t need more than 25,000 genes to function.
b. the exons used to make a specific mRNA can be rearranged to form different proteins.
c. the sample size used to sequence the human genome was not big enough, so the number of genes estimated could be low.
d. the number of genes will increase as scientists find out what all of the noncoding DNA actually does.
Answer: b. the exons used to make a specific mRNA can be rearranged to form different proteins.
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Recall that the phloem sap of vascular plants moves through the phloem as a result of turgor pressure. How are nutrients transported through fungi?
A. through hyphae, as a result of turgor pressure B. through sieve tubes, as a result of turgor pressure C. through vessel elements, as a result of turgor pressure D. through hyphae, as a result of capillary action E. through sieve tubes, as a result of capillary action
How could heavily fertilized lawns contribute to cyanobacterial blooms in lakes and oceans?
A. Run-off from the lawns will get into the water system, leading to large amounts of nitrogen that can be used by cyanobacteria in water systems. B. The large amounts of nutrient-rich grass that are created will be mowed down, with grass clipping bits eventually washing into sewer systems and into larger bodies of water. These grass clippings will serve as a nutrient source for cyanobacteria, leading to blooms. C. Large amounts of fertilizer will lead to excessive production of greenhouse gases (like CO2) from grass in lawns. Excessive CO2 production will lead to large blooms of cyanobacteria in water systems. D. They won't-the two systems are completely unrelated. How could grass in lawns contribute to effects in lakes and oceans?
Chromosomes will break at particular spots and undergo several translocations. Which species has not undergone chromosome breakage and translocations? a. Humans b. Pigs c. Cows d. All have undergone breakage and translocations
e. Mice
Radiolarians have characteristic ____, which are thin, ray-like strands of cytoplasm supported
internally by bundles of ____.
a. axopods; microfilaments b. axopods; microtubules c. spicules; microfilaments d. spicules; microtubules e. microfilaments; axopods