Nokea
The cell membranes in skeletal muscle
- A. Are impermeable to fat-soluble substances.
- B. Are more permeable to sodium than to potassium ions.
- C. Become more permeable to glucose in the presence of insulin.
- D. Become less permeable to potassium in the presence of insulin.
Correct Answer: C
Rationale: Insulin increases glucose uptake by facilitating transporter movement to the muscle cell membrane.
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Facilitated diffusion refers to the process of
- A. movement along a concentration gradient assisted by protein carrier molecules.
- B. movement of ions and molecules along a concentration gradient.
- C. transport of molecules and ions against their concentration gradient.
- D. water movement through a semi-permeable membrane
Correct Answer: A
Rationale: Facilitated refers to the role of the protein carriers. The other choices refer to diffusion, active transport and osmosis respectively
The smallest unit of an element that has all the properties of that element is a(an):
- A. atom
- B. gas
- C. molecule
- D. isotope
Correct Answer: A
Rationale: An atom is the smallest unit retaining an element's chemical properties.
Which organelle and function is correctly matched?
- A. Smooth ER - makes proteins
- B. Peroxisomes - produce ATP
- C. Golgi apparatus - processing and packaging materials
- D. Ribosomes - movement by the cell
Correct Answer: C
Rationale: The Golgi apparatus processes and packages materials; other matches are incorrect.
Individuals can slow the rate of aging by modifying all of these lifestyle aspects except for
- A. diet
- B. exercise
- C. genetic factors
- D. stress
Correct Answer: C
Rationale: Diet, exercise, and stress can be modified to slow aging, but genetic factors are inherited and unchangeable.
Which statement is true of the 23 chromosomes within a sperm?
- A. 23 chromosomes is the diploid number
- B. 11 chromosomes came from the father, 11 chromosomes came from the mother, while one of either the Y or the X came from the father or mother respectively.
- C. Some of the 23 came from the father and the rest came from the mother.
- D. 11 chromosomes and the Y came from the father, while 11 chromosomes came from the mother.
Correct Answer: C
Rationale: A sperm has 23 chromosomes which is the haploid number. The male that produced the sperm has 46 chromosomes(23 pairs) in their somatic cells "“ 23 each from the man's father and mother. When sperm are produced, the 46 chromosome assemble and pair up. The man's X and Y chromosomes pair up. Each pair of chromosomes then separates so that only one of each pair moves into a new sperm. Which one of the pair ends up