What enzyme breaks the hydrogen bonds between bases?

helicase

DNA polymerase

amylase

pepsin

The baroreceptors in the carotid sinus and aortic arch are sensitive to which of the following?

Many species of bacteria die quickly in very salty environments. how is this related to a bacterium's need to maintain its water level

What are the chambers of the mammalian heart

What are the two main stages of the cell cycle? Check all that apply.

Which of the following events happens first in the development of a new organism? a. A morula is formed. b. A blastocyst implants into the uterine wall. c. A sperm fertilizes an egg to form a zygote. d. A zygote undergoes mitosis.

In a plants stem the vascular tissue is A. is always arranged in rings of vascular bundles B. is continuous from the roots to thel leaves C. carriers nutrients up the stem but not down D. plays a role in photosynthesis and storage.

During which stage of sex cell formation does the number of chromosomes decrease from diploid (2n) to haploid (n) ? a. prophase 1 b. prophase 2 c anaphase 1 d. anaphase 2

What would most likely interest an environmental scientist

Do you believe you have a personal responsibility to protect the environment

What happens to the total charge of the compound after the ions bond together?