Down syndrome involves trisomy ____.
A. 3
B. 5
C. 15
D. 19
E. 21
Answer: E
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A haploid structure contains __________________, and a diploid structure contains _______________
A. one set of chromosomes (1n); two sets of chromosomes (2n) B. three sets of chromosomes (3n); two sets of chromosomes (2n) C. two sets of chromosomes (2n); one set of chromosome (1n) D. one set of chromosomes (1n); three sets of chromosomes (3n)
A researcher has mapped the entire genome of an insect. She notices that the genome contains around a thousand copies of a particular DNA sequence. What is the most likely function of this DNA sequence?
A. The sequence most likely has no function. B. Its function is to code for rRNA. C. Its function is to provide antibiotic resistance. D. Its function is to copy and move within the genome via an RNA intermediate.
Humans are classified as a late-loss population
Indicate whether the statement is true or false
Spiders breathe by means of
a. Gills b. Diffusion across the soft cuticle c. An extensive system of tracheae more complex than is found in insects d. Book lungs or primitive tracheae e. Coxal glands