BIOL1202 - Chapter 27

Which of the following features occurs in prokaryotic and in some eukaryotic cells?

a cell wall

A gene that has two alleles, A and a, is located on the same chromosome as a second gene that also has two alleles, B and b. Suppose a diploid individual has alleles AB on one copy of this chromosome and alleles ab on the other copy of this chromosome. For this individual, select the pair of recombinant genotypes that could result if crossing over occurs between these two chromosomes.

Ab and aB

In the evolutionary tree shown, identify the sister taxon or taxa of iguanas.

the group consisting of monitor lizards and glass lizards

Why is salt a good preservative to use for foods such as pork and fish?

prokaryotic cells living in the food will shrink from their cell walls, impacting their ability to reproduce

Gram-negative bacteria have _____ peptidoglycan than gram-positive cells, and their cell walls are _____ complex structurally.

less; more

A gram-negative cell wall consists of _____.

a thin layer of peptidoglycan surrounded by an outer membrane containing lipopolysaccharides

Bacteria that _____ tend to have abundant internal membranes.

are photosynthetic

Bacterial flagella have a very complex structure composed of 42 distinct proteins. What is the most likely explanation for the evolution of these complex structures?

exaptation recruited non-flagellar proteins to new functions