Which contraceptive approach is least effective?
a. abstinence
b. tubal ligation
c. vasectomy
d. hormonal implant
e. rhythm method
ANSWER: e
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Match the following items with the correct phrases.
_______1. Enable certain strains of Neisseria gonorrhoeae to adhere to the inner walls of the urethra. _______2. Enable Streptococcus pneumoniae to avoid being phagocytized early in the infection. _______3. A virulence factor specifically associated with Streptococcus pyogenes. _______4. Enable some bacteria to penetrate deeper and deeper into tissues. _______5. Enable some staphylococci and streptococci to dissolve clots. a. capsules b. pili c. M-protein d. kinases e. hyaluronidases
Which association is incorrect
A) mouth- starch digestion B) esophagus - protein digestion C) small intestine - starch, lipid, protein digestion D) stomach - food storage E) liver - production of bile
Which of the following statements is true?
a. Chromosomes are classified into two categories, the sex chromosomes that determine gender and autosomes that determine non-gender related traits. b. Homologous chromosomes differ in banding patterns, the traits they code for and size. c. While sex chromosomes determine different genders they look the same until they are stained. d. In humans all 46 chromosomes have an identical match called the homologue.
Starting from the wild mustard Brassica oleracea, breeders have created the strains known as Brussels sprouts, broccoli, kale, and cabbage. Therefore, which of the following statements is correct?
A) In this wild mustard, there is enough heritable variation to permit these different varieties. B) Heritable variation is low in wild mustard—otherwise this wild strain would have different characteristics. C) Natural selection is rare in wild populations of wild mustard. D) In wild mustard, most of the variation is due to differences in soil or other aspects of the environment.