A Deoxyribonucleoside Is a

question 35

Multiple Choice

A deoxyribonucleoside is a

• A) deoxyribose plus a nitrogenous base.
• B) sugar and a phosphate.
• C) deoxyribose plus a nitrogenous base and a phosphate.
• D) ribose plus a nitrogenous base.
• E) nitrogenous base bonded at the 5´ end to a sugar-phosphate backbone.

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Definitions:

Trophoblast

The outer cell layer of a late blastocyst, which in placental mammals gives rise to the chorion and to the fetal contribution to the placenta.

Blastocyst

An early stage of mammalian embryonic development, characterized by a sphere of cells surrounding a fluid-filled cavity and an inner cell mass that will develop into the fetus.

Limb Buds

The early developmental structures in vertebrate embryos which will develop into the limbs (arms and legs).

Muscles Differentiate

The process by which muscle cells undergo specialization, acquiring characteristics specific to muscle tissue types such as skeletal, cardiac, or smooth muscle.