Although all of the cells in your body contain a complete set of DNA, different types of cells arise because__________.
a) different genes are switched on and off in each type of cell
b) the contain different chromosomes
c) they contain different genes
d) none of the above
Answer: a) different genes are switched on and off in each type of cell
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The hormone that controls the concentration of urine is:
a. insulin b. glucagon c. antidiuretic hormone d. thyroxine e. epinephrine
Studies of glucose transport in liposomes have revealed that:a
glucose is transported against a concentration gradient. b. the binding of glucose triggers a conformational change in the carrier protein. c. the transport of solutes via carrier proteins is faster than via channel proteins. d. glucose phosphates move readily across the membrane by simple diffusion. e. glucose moves readily across the membrane by simple diffusion
Each breed of dog is known to be susceptible to certain illnesses, such as heart problems, eye disorders, or thyroid problems. Why do dog breeders often go to great lengths to breed a dog that's unrelated to a dog they want to breed?
A) Individuals closely related are more likely to have the same deleterious genes. B) Individuals closely related are less likely to want to mate. C) Breeding individuals that are closely related may produce an interesting new set of characteristics. D) Breeding individuals that are closely related will result in greater fitness for the offspring.
The cell's series of tunnel-like membranes functioning in transport and storage are the
A. endoplasmic reticulum. B. lysosomes. C. mitochondria. D. chloroplasts. E. Golgi apparatus.