How many different types of tissue cells are there in humans?

A. 20,000

B. 20

C. 2,000

D. 200

The head of a giraffe is 2.0 m above its heart and the density of the blood is 1.05 103 kg/m3. what is the difference in pressure between the giraffe's heart and head?

The 3-dimensional structure of a protein determines the activity of that protein. Describe what we mean by the "Delicate balance of protein structure".

Various enzymes function most efficiently under different sets of "optimal" conditions. explain why this is the case.

Reflector telescopes have chromatic aberration. True False

Primary succession begins after a?

Hemophilia A is an X-linked recessive mutation in humans. If a couple gives birth to a daughter with hemophilia A, which of the following may be the genotype of the parents? a. XCXC and XCY b. XCXC and XcY c. XCXc and XcY d. XcXc and XCY

What happens to the products of the Krebs cycle? A: Most become reactants in the electron transport chain. B:They are stored in vacuoles and removed from the cell. C:Most become reactants in protein synthesis.

Certain parrot species cannot be brought to the United States to be sold as pets. What is the name of the legislation that makes this illegal? Red List Migratory Bird Act CITES Endangered Species Act (ESA)

Why do you think aquatic animals that rely on diffusion for respiration are often small in size?

The plant Arabidopsis Thaliana Has a gene which has been found to show an unusually high rate of mutation which conclusion is best supported by this observation? A. The genus control by environment and not heredity B.