As you recall, a single enzyme molecule may catalyze a reaction many times. In signal transduction
pathways, which may utilize several enzymes, the result is _________.
a. amplification of the final product
b. denaturation of non-essential proteins
c. hydrolysis of signal molecules
d. transformational modification of the receptor
e. change in cell membrane permeability
A
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Answer the following statements true (T) or false (F)
1. If a cell contains 20 units of DNA during G2, it will have 40 units of DNA during S. 2. During prometaphase, the sister chromatids organize into a single row in the center of the cell. 3. A cell undergoing meiosis that contains sister chromatids may be either haploid or diploid. 4. One major difference between metaphase I and metaphase II is the presence or absence of bivalents. 5. Sexual life cycles include both haploid and diploid stages.
Threatened species
A. are rare species that are exploited by humans. B. are species likely to become endangered in the future. C. are currently in danger of extinction throughout all or most of their range. D. will be extinct within 100 years. E. are found only in captivity.
Which of the following choices is NOT
TRUE? a. Carotenoids use yellow and red light to assist in photosynthesis. b. Carotenoids are accessory pigments that capture certain energy from light and transfer it to chlorophyll a. c. The presence of carotenoids in a leaf is masked by the presence of chlorophyll throughout the growing season. d. Carotenoids absorb blue and violet wavelengths and reflect red, orange, and yellow. e. Both carotenoids and anthocyanins reflect red wavelengths
Which of the following is a serious form of skin cancer that spreads quickly to other parts of the body?
a. squamous cell carcinoma b. multiple myeloma c. basal cell carcinoma d. malignant melanoma e. oat cell carcinoma