To move, an animal must expend ____ to overcome the effects of ____ and friction.

A) oxygen; respiration
B) muscle contractions; fatigue
C) nutrients; motion
D) glucose; movement
E) energy; gravity

Antonie van Leeuwenhoek was a Dutch tradesman and scientist who is famous for inventing the microscope.

What is a goal of human therapeutic cloning?

A) to transfer cells from an unrelated individual into a patient needing a transplant
B) to create pluripotent cells for medical research only
C) to make a new individual, who is genetically identical to a patient needing a transplant
D) to create pluripotent stem cells using a patient's nucleus
E) to extract ES cells from an embryo

The simple plant tissue known for photosynthesis, storage, and secretion is ____.

A) vascular
B) parenchyma
C) collenchyma
D) sclerenchyma
E) dermal

Chemical substances, secreted by cells into the extracellular fluids, regulate the metabolic function of other cells in the body are called ________.

A) enzymes
B) hormones
C) antibodies
D) proteins

Match each stage with the events listed.
A)sister chromatids separate
B)chromosomes start to condense
C)new nuclei form
D)all duplicated chromosomes are aligned at the spindle equator _______ metaphase
_______ prophase
_______ telophase
_______ anaphase