Practice Questions

TLS Online TPP Program

#Question id: 11371

Which statement about gram-negative bacteria is correct?

#Unit 9. Diversity of Life Forms

Penicillins are the best antibiotics to use against them.
They often possess an outer membrane containing toxic lipopolysaccharides.
Their chromosomes are composed of DNA tightly wrapped around large amounts of histone proteins.
Their cell walls are primarily composed of peptidoglycan

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TLS Online TPP Program

#Question id: 32139

#Unit 1. Molecules and their Interaction Relevant to Biology

The core of the helix consists of the base pairs that stack together through

TLS Online TPP Program

#Question id: 32141

#Unit 1. Molecules and their Interaction Relevant to Biology

A classic experiment that was performed in the 1970s showed that DNA absorbed on a mica surface shown to have

TLS Online TPP Program

#Question id: 32149

#Unit 1. Molecules and their Interaction Relevant to Biology

The base pairs move apart to accommodate by intercalating agent such as

TLS Online TPP Program

#Question id: 33443

#Unit 1. Molecules and their Interaction Relevant to Biology

Which of the following is not an unusual base?

TLS Online TPP Program

#Question id: 33444

#Unit 1. Molecules and their Interaction Relevant to Biology

Ribofuranose rings in nucleotides can exist in four different puckered conformations. Which pair of carbon undergoes to puckering conformation?

TLS Online TPP Program

#Question id: 33445

#Unit 1. Molecules and their Interaction Relevant to Biology

Identify the structure