If there are 12 sister chromatids in a cell, how many centromeres are there?

a. 12

b. 24

c. 6

d. 36

What is the range for the volume of urine normally excreted in a 24-hour period

Cell theory was discovered and advanced because of the development of which instrument?

Key information in DNA specifies the sequence of amino acid subunits that will compose enzymes and other proteins in the cell.

In the molecular models to the right, the blue atoms are hydrogen, the red atoms are oxygen, and the gray atoms are carbon. Identify the organic molecule by circling it. What distinguishes molecule from the other? Explain your reasoning.

Hummingbirds drink nectar from flowers. Your teacher has asked you to make a model of a flower that would attract a numu. What is one important feature you should include in your model? A. small flowers. B. Large, flat leaves. C.

Which derived characteristic is shared by at least four organisms? Large brain Lungs Mammary glands Placenta

Question 2 For an object to remain at rest, which of the following must be true? A. The forces on it are balanced B. There is no friction C. Gravity doesn't act on it D. The object has no mass

Identify another invertebrate chordate other than hagfish.

If an amino acid has a side chain (r group) that is charged (i. e. bears a full + or - charge), which amino acid group would it belong in?

If an object with a mass of 100 kg on earth is taken to a planet that has more gravity, how will this affect the object's mass and weight?