Quaking aspen trees can send out underground stems for asexual reproduction. Sexual reproduction is not as common, but when it does happen, the haploid gametes have 19 chromosomes. How many chromosomes are in the cells of the underground stems?
a. 32
b. 22
c. 38
d. 40
Ans: c. 38
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Which of the following structures DOES NOT occur in a series of successive segments of an earthworm?
A. crop B. nerve cord C. setae D. circular muscles E. metanephridia
The subatomic particles that surround the nucleus are the ________.
A. electrons B. neutrons C. protons and neutrons D. protons and electrons E. protons
Species of fossil organisms are morphospecies, which means they are defined on the basis of ________
A) DNA sequence similarities B) mate recognition behaviors C) anatomical features D) ability to interbreed E) the locations where they are found
________ is the organelle associated with the functions of steroid biosynthesis, carbohydrate metabolism, and drug detoxification
Fill in the blank with correct word.