Which structure of the male reproductive system is also part of the urinary system?
A. testes
B. urethra
C. bulbourethral gland
D. vas deferens
E. prostate gland
Answer: B
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Archaea use molecules with reactive side chains in their plasma membrane, so the tails of archaeal phospholipids form covalent bonds with one another. As a result, the plasma membrane is ____
a. more fluid b. less rigid c. less fluid d. able to contain more membrane proteins e. easily disturbed
Which of the following should NOT be used in
the development of science? a. evaluation of data b. personal conviction c. prediction d. systematic observation e. sharing ideas
Molecules of life include which one of the following?
A) water, proteins, lipids, nucleic acids, carbohydrates B) proteins, saturated fats, monosaccharides, but not polysaccharides C) lipids and proteins only D) any noncarbon base molecule E) nonsugar carbohydrates, proteins, lipids, water
At the current rate of habitat destruction, what percentage of all living species will be extinct in 50 years?
A) 1% B) 10% C) 25% D) 50%