All the interconnected feeding relationships in an ecosystem make up a food interaction. chain. network. web.

Consider a population of wildflowers in which the frequency of the red allele $C^{R}$ is $p=0.7$ What is the frequency of the white allele $(C^{W})$ in this population? o 0.3 0.49 0.7

All of the following are nonsteroid hormones except: oxytocin. calcitonin. cortisol. glucagon.

Listed below are steps from the sequence of excitation-contraction coupling in skeletal muscle cells. Select all the steps that are correct. Voltage-gated calcium channels open allowing calcium to enter the skeletal muscle cell from the extracellular fluid Myosin heads bind actin D Acetylcholine binds to nicotinic acetylcholine receptors resulting in sodium entering the cell. Voltage-gated calcium channels open to allow calcium into the SR An action potential is propagated along the muscle cell membrane and into T-tubules. Calcium binds to tropomyosin

During nervous system development a. the cerebral hemispheres form as a fusion of the diencephalon and mesencephalon b. the mesodermal tissue becomes the meninges c. neural crest cells fuse to form the neural tube d. the neural plate splits at both ends to form the neural crests

True or false: Protein comes only from animal sources and not from plant sources. True False

teoclast activity decreases when __ levels are elevated Multiple Choice vitamin C calcitonin vitamin D growth hormone parathyroid hormone

Hydrogen peroxide is produced in our cells and it is toxic to cells. True False

Why are individuals of the same species not all identical? Individual organisms adapt depending on their environment. Variation is introduced through mutations in genes. All individuals develop differently to become an adult.

What do scientists mean when they use the term genetics? the unique set of instructions that include everything a cell might need for creating your body parts and maintaining them over the lifespan some of your observable characteristics are inherited and have been triggered by the genetic sequence inside of your cells. a type of cell division that creates two new identical cells a spiral-shaped structure made up of paired chemicals code

Blood cells are produced in the __ bone marrow through a process called hematopoiesis. yellow red white