The molecule that carries an amino acid to the ribosome for incorporation into a protein is ________
A) ATP
B) messenger RNA (mRNA)
C) ribosomal RNA (rRNA)
D) DNA
E) transfer RNA (tRNA)
E
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The molecules that stabilize the cell membrane and prevent it from breaking easily are the:
a. phospholipid molecules b. cholesterol molecules c. protein molecules d. all of the above
There are 7 tarsals in each foot, and 8 carpals in each hand, but the upper limb and the lower limb contain the same number of bones. How can this be explained?
A. The arm contains 1 bone, while the thigh contains 2 bones. B. The forearm contains 2 bones, but the leg contains only 1 bone. C. The foot contains 1 more metatarsal than the hand. D. The upper limb has no counterpart for the patella. E. The foot contains 1 more phalanx than the hand.
Water accounts for 50% of the weight of a young adult female and 60% of a young adult male. What kind of bond is found at "B"?
A. oxygen atom B. polar covalent bond C. water molecule D. hydrogen atom E. hydrogen bond
Which of the following is a congenital defect of the male reproductive system?
A. Androgen-insensitivity syndrome B. Erectile dysfunction C. Hypospadias D. Benign prostatic hyperplasia