In humans, the genetic basis for determining the sex "male" is accomplished by the presence of ________
A) high levels of estrogen
B) a balance between the number of X chromosomes and the number of haploid sets of autosomes
C) a portion of the Y chromosome
D) multiple alleles scattered throughout the autosomes
E) one X chromosome
C
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Insects use _____ as a respiratory system
a. integument exchange b. lungs c. tracheal exchange d. gills e. capillary tubes
Which of the following is incorrect regarding the active site of an enzyme?
a. is unique to that enzyme b. is the part of the enzyme where its substrate can fit c. can be used over and over again d. is not affected by environmental factors such as pH and temperature
What is the centriole's function in the cell?
a. It organizes the cell's contents. b. It stabilizes the nucleus in the middle of the cell. c. It is an anchoring point for the spindle apparatus during nuclear division in animalcells d. It is an anchoring point for the spindle apparatus during nuclear division in plantcells.
The female reproductive system contains all of the following structures except the
a. cervix. b. Bartholin's gland. c. clitoris. d. acrosome. e. labia.