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?

#XL - T Zoology

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: 20118

#XL - P Chemistry

Compounds with high heat of formation are less stable because

TLS Online TPP Program

#Question id: 369

#XL - Q Biochemistry

Calculate the pH of a 2.0 L solution containing 10 mL of 5 M acetic acid and 10 mL of 1 M sodium acetate. (pKa = 4.76)

TLS Online TPP Program

#Question id: 14833

#XL - S Microbiology

The pneumococcal vaccine is directed against the

TLS Online TPP Program

#Question id: 161

#XL - T Zoology

Two amino acids of the standard 20 contain sulfur atoms. They are:

TLS Online TPP Program

#Question id: 8861

#XL - T Zoology

Which of the following is true of members of the phylum Cnidaria?