How many electrons does carbon have available for chemical bonding?

one

two

four

What kind of bonds connect the bases of DNA to each other? a. ionic b. hydrogen c. covalent d. van der Waals e. protonic

Which of the following are biotic factors in an ecosystem? a. Rain sunlight plants. n. plants animal bacteria. c. temperature animals plants. d. animals minerals in the soil, rain

Which correctly lists all the structures that secrete lipase? pancreas and stomach pancreas, salivary glands, and stomach pancreas and salivary glands pancreas, salivary glands, and liver

What are the receptors for static equilibrium?

Which of the following is not a way in which carbon gases are introduced into the atmosphere? A. Forest fires B. Respiration C. Photosynthesis D. Burning of fossil fuels

N a lab you are conducting tests with various chemicals and neurotransmitter receptors. you notice that exposed frog muscle cells depolarize when you add the chemical nicotine to the acetylcholine (ach) receptors.

What property of henrietta lacks' cells was most unusual when they were grown in the laboratory?

Which of the following are the reproductive parts of an angiosperm flower? A. anther and ovary B. sepal and anther C. vary and stigma D. sepal and stigma

Clouds are formed when water vapor Question 4 options: rises and heats up. falls and heats up. rises and cools down. falls and cools down.

What happens when an enzyme's structure as it exceeds the typical human body temperature