Remnants of a pelvic girdle and hind limb bones can still be found in the skeleton of a modern snake. Darwin explains that these organs have become vestigial because

True or false? Evolution of behavior may have a genetic component.

Restriction enzymes function by locating sequences of DNA known as recognition sites which identify locations where DNA will be cut. Each restriction enzyme has a unique recognition site. The recognition site of the restriction enzyme Taq I (Thermus aquaticus) is: 5′ —T C G A — 3′ How many recognition sites does this DNA sequence contain? 5′ — T A C A T G T C G A A A A T C G C G T A T C G A C C C G A T G C T A C A T C G A T  — 3′

The most useful bacterial plasmids for creating recombinant DNA have which specific regions? (check all that apply)

True or false? Both plants and animals can have an internal 24-hour rhythm called a circadian rhythm.

Which of the following defines directional selection?

What is the best manipulation to undertake to achieve the goal of increasing the carrying capacity of a population of native (wild) plants in a given area (for example, a grassland habitat)?

According to Darwin, the most crucial factor in evolution is ______.

In his travels in South America, Darwin encountered fossils of marine organisms high in the Andes mountains. This reinforced what he already believed, which is that 

According to this phylogenetic tree, which clade derived from its common ancestor approximately 475 million years ago? ” A timeline at the top right spans from 100 to 600 million years ago. The phylogenetic tree shows branching relationships with colored lines representing different lineages. Tunicate branches off first at approximately 600 million years ago, shown with a black line. Amphioxus branches next at approximately 550 million years ago, also with a black line. Lamprey branches at approximately 500 million years ago with a magenta line extending to the present. A group of four fish species branches next, shown with light blue lines. Zebrafish, Medaka, Fresh Puffer, and Pufferfish all branch between approximately 450 and 400 million years ago. Clawed Frog branches at approximately 375 million years ago with a yellow-green line. Green Anole branches at approximately 325 million years ago, also with a yellow-green line. Chicken branches at approximately 300 million years ago. Opossum, Mouse, and Human branch as a group at approximately 200 million years ago, with orange lines extending to the present for all three species. On the left side, seven heart diagrams are arranged vertically corresponding to the organisms on the tree, showing increasing complexity from top to bottom. Black arrows point from each organism name to its corresponding heart structure. Each heart is illustrated with red chambers and blue blood vessels. The tunicate heart is a simple curved tube. The amphioxus heart is a tube with a knot-like structure in the middle. The lamprey heart shows two chambers with blue vessels at the top. The zebrafish through pufferfish group shares a heart with two atria at the top and a single large ventricle below. The clawed frog heart shows two atria and a partially divided ventricle. The green anole heart shows two atria at the top and a ventricle below with partial division. The chicken heart displays four distinct chambers with clear separation. The opossum, mouse, and human group shares a heart at the bottom with four chambers showing the most complex structure.”