Problem:OPTIONS:
- factor
- mass
- volume
- weight

Q: What is the measure of the force of gravity pulling down on an object called? A:
****
A: weight

Q: What do you call large, y-shaped proteins that recognize and bind to antigens? A:
OPTIONS:
- proteins
- membranes
- parasites
- antibodies
antibodies

Q: What are muscle cells in the muscles called? A:
OPTIONS:
- human fibers
- use fibers
- job fibers
- muscle fibers

Answer: muscle fibers

Question: Q: Hormones produced by what gland in the neck increase the rate of metabolism in cells throughout the body? A:
OPTIONS:
- pituitary
- kidney
- thymus
- thyroid
Answer: thyroid

input with options: Q: What is critical for the formation of hemoglobin? A:
OPTIONS:
- salts
- proteins
- platelets
- iron ions
output: iron ions

Problem: OPTIONS:
- concave
- angular
- cylindrical
- convex
Q: Q: The most common two-lens telescope, like the simple microscope, uses lenses of what shape? A:
Answer:
convex