New World monkeys evolved approximately 30 million years ago. These animals are easy to identify because they
A. have opposable thumbs and binocular vision.
B. have prehensile tails and hair.
C. have protruding noses and prehensile tails.
D. have flattened noses and prehensile tails.
E. have opposable thumbs and protruding noses.
D. have flattened noses and prehensile tails.
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Two principal organelles in eukaryotes that were apparently derived from different types of bacteria are the
A. microfilaments and microtubules. B. mitochondria and chloroplasts. C. rough ER and smooth ER. D. plasma membrane and nuclear membrane.
Triploid cells have three copies of each chromosome rather than two. If a triploid cell undergoes
meiosis, it produces inviable products. Why is this the case?
What will be an ideal response?Muscle fatigue is a result of
1.accumulation of lactic acid. 2.exhaustion of available ATP. 3.reduction in lactic acid. 4.failure of calcium channels to open after prolonged use. 5.inactivity of muscles for prolonged periods of time.
How do the kidneys help maintain constant water levels in the body?
a) by causing people to produce more sweat during hot weather b) by removing wastes from the blood c) by storing water in the urinary bladder d) by reabsorbing water in nephrons