#Question id: 2174
#Unit 2. Cellular Organization
The major ATP-powered pump responsible for maintaining ion gradients across the plasma membrane of mammalian cells is:
#Question id: 3607
#Unit 8. Inheritance Biology
Cystic fibrosis is caused by a recessive lethal gene and can be detected by an excess concentration of chloride in sweat. If a sweat test reveals a man to be heterozygous and his wife to be homozygous normal, what are the chances that their children will have the disease?
#Question id: 2219
#Unit 2. Cellular Organization
Cholesterol and phospholipids are transported between organelles by
i. Golgi-dependent mechanisms.
ii. incompletely characterized vesicle populations.
iii. direct contact between membranes and, to some extent, small, soluble lipid-transfer proteins.
Which of the following statements are correct?
#Question id: 3296
#Unit 11. Evolution and Behavior
Some beetles and flies have antler-like structures on their heads, much like male deer. The existence of antlers in beetle, fly, and deer species with strong male-male competition is an example of
#Question id: 5669
#Unit 5. Developmental Biology
What is the reproductive difference between sea urchins and mammals is?