Chapter08
practice
1. a geneticist is studying the karyotype of a person with a normal number of chromosomes. which of the
following would be the correct chromosome configuration?
a. 22 pairs of autosomes and one pair of sex chromosomes
b. 22 autosomes and 1 sex chromosome
c. 22 pairs of alleles and one pair of sex chromosomes
d. 46 pairs of autosomes and one pair of sex chromosomes
e. 46 pairs of alleles and one pair of sex chromosomes

Neelaredoxin is a 15-kda protein that is a gene product common in anaerobic prokaryotes. it has superoxide-scavenging activity, and it is constitutively expressed. in addition, its expression is not further induced during its exposure to o2 or h2o2 (silva, g., et al. 2001. j. bacteriol. 183: 4413–4420). which of the following statements best describes neelaredoxin synthesis? a-neelaredoxin is produced at all times; levels are constant even when exposed to o2 or h2o2.b-neelaredoxin is produced at all times; exposure to o2 or h2o2 increases expression.c-neelaredoxin is produced at all times; exposure to o2 or h2o2 decreases or prevents expression.d-neelaredoxin is only produced when there is exposure to o2 or h2o2.

Question#29: why does the tropical ocean have a greater temperature range than the temperate ocean?

In general, characteristics that an organism survive and reproduce become more common over time. what mechanism of evolution causes this?