Gymnosperms
A. are usually insect pollinated.
B. are found above the timberline on mountains.
C. are seed-bearing plants.
D. have flowers.
C. are seed-bearing plants.
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Which of the following statements about phloem unloading at sinks is inconsistent with our current understanding?
A) Passive transport plays a role. B) Regardless of the type of sink, the conversion of sucrose to storage compounds such as starch is a major part of the process. C) The mechanisms of sucrose movement and the membrane proteins involved vary among different plant species. D) The mechanisms of sucrose movement and the membrane proteins involved vary among different sinks within a plant. E) Active transport plays a role.
Why is human population genetic variation lower than the level of variation seen in other species?
A. Humans have a smaller population size than any other species. B. Humans have a larger population size than any other species. C. Human ancestral lineages are relatively old compared to other species. D. Human ancestral lineages are relatively young compared to other species. E. Humans have a much lower genetic mutation rate. F. Humans have much higher rates of gene flow than other species. G. Humans have a much lower birth rate and reproductive success compared to other species.
What is the most compelling reason why DNA, rather than RNA, evolved to be the storage repository for genetic information in cellular life forms?
A. DNA molecules are more chemically stable than RNA molecules. B. DNA has deoxyribose rather than ribose. C. DNA is double-stranded rather than single-stranded.
What are concerns regarding glove use? (Choose all that apply)
> Gloves can rip > Some people are allergic to nitrile > Gloves are flammable and can melt > Contamination that gets on gloves can be transferred to other surfaces, people, pens, pencils, microscopes, etc. > Some people are allergic to latex > Tight fitting gloves can restrict circulation