Which of the following statements is most true concerning speciation by polyploidy?
a. Polyploidy has been an important driver of plant diversification.
b. Polyploidy only leads to speciation in plants.
c. Botanists believe only a few plant species have arisen through polyploidy.
d. Polyploidy only leads to speciation in animals.
e. Polyploidy is common but has no effect on speciation.
Answer: a. Polyploidy has been an important driver of plant diversification.
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Fructose and galactose both have six carbon atoms, twelve hydrogen atoms and six oxygen atoms, just like glucose. A friend of yours says: "Since those sugars have the same number of atoms, they should have the same name." You Answer: "While they do have the same number and type of atoms,
A. they are all polysaccharides and have slightly different functions within organisms and therefore have different names." B. they are named differently because of their quaternary structures, which is very important in carbohydrates, especially glucose." C. they are named differently because when heated above their optimal temperature they become denatured and will not react with their substrates." D. they are named differently because they are involved in different DNA nucleotide formation." E. they are named differently because they are alternate forms of the monosaccharide, glucose."
The RNA World hypothesis isdirectly supported by all the following except:
A. catalytic RNAs. B. ribozymes showing diverse function. C. ribosome structure. D. micelle to vesicle formation.
The structure that is shared between the male reproductive and urinary systems is the ________
A) prostate gland B) seminal vesicles C) urethra D) seminiferous tubules
Early biologists referred to animals as ''simple'' and ''advanced,'' but now it is more accurate to use the following terms:
A. ''allopatric'' and ''sympatric,'' since the species is most important. B. "generalists'' and ''specialists,'' since this is how biologists classify characters. C. ''simple'' and ''complex,'' since anatomy terms are more exact. D. ''evolved'' and ''un-evolved,'' since everything ties together with evolution. E. ''primitive'' and ''derived,'' since some early forms became very complex and some evolved forms are derived from them but lost characters and are simple.