Quality control is set up on urea media. Which two organisms should be used to determine the validity of the media?
a. C. ulcerans and C. diphtheria
b. C. diphtheria and Streptococcus pneumo-niae
c. C. ulcerans and Corynebacterium pseu-dotuberculosis
d. C. glucuronolyticum and C. ulcerans
A
The only organisms that are positive and negative for urea are C. ulcerans and C. diphtheria. The other organisms are either both positive or both negative for urea.
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Which of the following statements is false?
a. The plasma membrane is more like a fluid than a solid. b. The cell membrane is symmetrical, so it is impossible to identify which is the extracellular surface. c. Calcium pumps move calcium ions across the membrane. d. In a plasma membrane, proteins shift positions and phospholipids flex their tails. e. There are functional differences between the two sides of the plasma membranes.
All of the following are associated with bone
formation EXCEPT a. osteoblasts. b. cartilage. c. osteoporosis. d. estrogen e. calcium.
Roots, stem, leaves, flower parts, and fruits are referred to as:
a. apical meristems. b. dermal tissues. c. vascular tissues. d. organs. e. ground tissues
Which of the following helps direct the formation of the primitive streak but contributes no cells to the embryo?
A) endoderm B) mesoderm C) ectoderm D) neural crest E) hypoblast