Which statement below is true? The lumen of arteries contains valves to allow one-way flow of blood Hydrostatic blood pressure is the same in arteries as veins Oxygen is delivered to tissues by passing across the walls of arterioles The walls of the left ventricle are thicker than the walls of the right ventricle

Inadequate calcium in the neuromuscular junction would directly affect which of the following processes? View Available Hint(s) Depolarization of the junctional folds Conduction of action potentials by the motor neuron Breakdown of acetylcholine by acetylcholinesterase Release of acetylcholine from the synaptic vesicles

4 When the frequency of a gene in a population changes, the most likely result would be (1)ecological succession (3) species extinction (2) biological evolution (4) genetic mutation

If the first nucleotide after the promoter on the bottom DNA strand is changed from C to T, what would the resulting nucleotide be on the mRNA? T A U C

What is the relationship between magnification and field of view diameter while using the compound microscope?

The motility test allows you to see a bacterium's flagella. A True B False

Which vertebrae would you expect to have the largest body, relative to the other regions? sacral lumbar thoracic cervical

82. Which organ in humans is most directly involved in the transplant of oxygen? a.) digestive b.) nervous c.) excretory d.) circulatory

Mary Anning reconstructed the fossil skeletons of many animals new to science During her studies, she discovered that some species have become extinct. Which of the following is one main reason a species becomes extinct? A. overproduction B. increased variation C. decreased competition D. climate change

Which would have most likely stopped Mendel from finding a pattern in his results? A. Being short is a recessive trait B. If having a wrinkled seed had been a recessive trait C. If garden peas had used sperm and egg to reproduce D. If seed color and shape were located on the same chromosome

The glycocalyx is composed of glycolipids,glycoproteins and cholesterol molecules that are displayed on the outside surface of the plasma membrane. True False