Which of the following characteristics of the fetus distinguishes it from the embryo?
A) Blood cells form and fill primitive blood vessels.
B) The primitive streak appears.
C) Bone replaces the softer cartilage.
D) The neural tube begins to form.
C) Bone replaces the softer cartilage.
You might also like to view...
Approximately, how many varieties of edible
apples existed in the days of Johnny Appleseed?
a. 6 b. 16 c. 160 d. 1600 e. 16,000
Which sentence best describes the general reproductive strategy of flowering plants?
a. They reproduce only sexually. b. They mainly reproduce sexually, although many will reproduce asexually under certain circumstances. c. They reproduce only asexually. d. They mainly reproduce asexually, although many will reproduce sexually under certain circumstances.
The optimum reaction rate of a particular enzyme occurs at pH 7.3 at 37°C. This reaction would probably proceed faster by
A) increasing the temperature to 38°C and keeping the pH at 7.3. B) increasing the pH and maintaining the temperature at 37°C. C) decreasing the pH and increasing the temperature. D) increasing both temperature and pH.
Which of the following describes a major component of the Staphylococcus aureus cell wall. It binds to the 'Fc' moiety (stem of the Y-shaped anitoby) of IgG, exerting an antiopsonin (and therefore strongly antiphagocytic) effect
A. capsule B. protein A C. cytolytic exotoxins D. superantigen exotoxins E. DNAse enzymes