Practice Questions

TLS Online TPP Program

#Question id: 5807

Which of the following would be an example of a germline mutation?

#Unit 8. Inheritance Biology

Exposure to excessive UV radiation causes changes in the DNA of a skin cell, leading to basal cell carcinoma (skin cancer).
In a very early human embryo, a mistake in mitosis causes loss of a Y chromosome in one daughter cell. The resulting child is a fertile male who is chromosomally partially male (XY) and partially female with Turner's syndrome (XO).
A man with normal chromosomes has a hip X-ray without a protective shield. Ten months later, his wife gives birth to a child with a chromosomal deletion.
An embryo missing one copy of the third chromosome is miscarried very early in pregnancy.

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TLS Online TPP Program

#Question id: 11698

#Unit 7. System Physiology – Animal

A patient has an elevated plasma thyroxine (T4) concentration, a low plasma thyroid-stimulating hormone (TSH) concentration, and a thyroid gland that is smaller than normal. Which of the following is the most likely explanation for these findings?

TLS Online TPP Program

#Question id: 1405

#Unit 4. Cell Communication and Cell Signaling

A gain-of-function mutation in which of the following would have the same effect as a gain-of-function mutation in Ras?

TLS Online TPP Program

#Question id: 415

#Unit 1. Molecules and their Interaction Relevant to Biology

Which one of the following compounds does not have a large negative free energy of hydrolysis?

TLS Online TPP Program

#Question id: 594

#Unit 1. Molecules and their Interaction Relevant to Biology

The catalytic proficiency of an enzyme is the ________.