All BUT one description applies to the structure of RNA. That is

A) four nitrogenous bases.

B) double-stranded molecule.

C) contains a phosphate group.

D) 5-carbon sugar called ribose.

Biologists divide mechanisms of reproductive isolation into

Organisms well suited to their environment: Select one: a. are always larger than organisms less suited to that environment. b. reproduce more successfully than organisms who are less suited for the same environment. c.

Which human activity has the most negative effect on the stability of an ocean environment

3) Cells using ATP to transfer substances in and out of the cell is called __transport A) active transport B) cellular transport C) passive transport

However, we need essential nutrients from our diets (since our bodies can not make them). and acids are examples of essential nutrients, along with vitamins and minerals.

What does the Magnuson Stevens Act deal with? A. setting up of marine sanctuaries B. prevention of overfishing C. regulating disposal of materials into the ocean D. protection of marine mammals

In addition to a thicker stratum corneum and the presence of a stratum lucidum, the thick skin of the palms and fingertips of the hands and of the soles of the feet have a denser array of sense receptors than thinner skin found elsewhere on the

Which of the following theories sees aging as a process whereby cells are assumed to have a limitation on the number of times they can reproduce to repair damage? a. wear-and-tear theory b. cellular clock theory c. activity theory d.

In humans, oculocutaneous (OCA) albinism is a collection of autosomal recessive disorders characterized by an absence of the pigment melanin in skin, hair, and eyes. That is, normal pigmentation (A) is dominant over albino characteristics.

How can a layer of rock containing a fossils could be present in a mountain wall that is several thousand feet above sea level