In a DNA molecule, which of the following forms a base pair with adenine?

A. Thymine

B. Cytosine

C. Adenine

D. Guanine

The only source of new brand new genetic variation in a species is:

A bacteria is considered gram positive when it retains the blue or purple color after decolorizer has been applied. a. True b. False

Which of the following traits is only found in vertebrates? a. a highly developed nervous system and internal skeleton b. a major function to obtain food and oxygen for energy c. multi-cellular bodies d. internal conditions are kept in balance

Why do most enzymes stop functioning after being soaked in a strong acid or base?

A child fell off the swing and scraped the right knee. the injured area becomes painful. what else will the nurse observe upon assessment?

How does the population growth rate affect how long Earth's coal supply will last? A. The coal supply lasts the longest when the population growth rate is high. B. The coal supply is used up the slowest when the population growth rate is average. C.

Within which structure does the placenta normally develop

A 29-year-old female presents with fever, cloudy urine, flank pain, and hematuria. these signs and symptoms support which diagnosis

What is the term for a male reproductive cell?

What happens if people keep killing sharks and who wants to stop it and how may do we kill a year