Practice Questions

TLS Online TPP Program

#Question id: 4949

What probably accounts for the switch to DNA-based genetic systems during the evolution of life on Earth?

#Unit 11. Evolution and Behavior

DNA is chemically more stable and replicates with fewer errors (mutations) than RNA.
Only DNA can replicate during cell division.
RNA is too involved with translation of proteins and cannot provide multiple functions.
DNA forms the rod-shaped chromosomes necessary for cell division.

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TLS Online TPP Program

#Question id: 5548

#Unit 5. Developmental Biology

Vertebrate lungs are derived from

TLS Online TPP Program

#Question id: 5549

#Unit 5. Developmental Biology

During initial stages of vertebrate cleavage, successive blastomeres

TLS Online TPP Program

#Question id: 5550

#Unit 5. Developmental Biology

The vertebrate nervous system is derived from

TLS Online TPP Program

#Question id: 5551

#Unit 5. Developmental Biology

When the vertebrate embryo grows into a hollow ball, it is called a

TLS Online TPP Program

#Question id: 5552

#Unit 5. Developmental Biology

Soon after gastrulation, dorsal ectodermal cells condense and form a tube called the _______________ tube.

TLS Online TPP Program

#Question id: 5553

#Unit 5. Developmental Biology

The notochord is a ___ structure in vertebrate embryos that lies under the ___, and is bordered by ___.