Analysis of a certain polymer shows that it contains phosphate groups, ribose groups, and pyrimidines

Based on this information, which of the following is the best description of this compound?
a. It is most likely ribonucleic acid.
b. It is DNA.
c. It is an inorganic compound.
d. It contains thymine.
e. It is a polypeptide


A

Biology & Microbiology

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The amniotic egg was a key adaptation allowing vertebrates to make the transition to life on land where diffusion to/from a watery environment could not allow a developing embryo to meet its metabolic needs

Its three membranes are the _____, which surrounds the embryo in a watery sac; the _____, which sequesters metabolic waste away from the developing embryo; and the _____, which surrounds the embryo and other sacs. A. amnion; chorion; allantois B. chorion; amnion; allantois C. chorion; allantois; amnion D. amnion; allantois; chorion E. allantois; chorion; amnion

Biology & Microbiology

In which tissue system of plants would you expect to find the guard cells?

A) Dermal tissue system B) Vascular tissue system C) Germ tissue system D) Ground tissue system

Biology & Microbiology

The oxidizing atmosphere probably developed about _____ billion years ago.

A. 1.5 B. 2.5 C. 3.5 D. 4.5

Biology & Microbiology

Which of these statements is true?

a. Parkinson’s disease can be treated by remaining intellectually active. b. A hunched posture and shuffling gait are symptoms of Autism Spectrum Disorder (ASD). c. Both Autism Spectrum Disorder (ASD) and Attention Deficit/Hyperactivity Disorder (ADHD) occur more frequently in male patients. d. Schizophrenia can be cured by electroconvulsive therapy.

Biology & Microbiology